- Research article
- Open Access
- Open Peer Review
Mental illness and intensification of diabetes medications: an observational cohort study
BMC Health Services Research volume 14, Article number: 458 (2014)
Mental health condition (MHC) comorbidity is associated with lower intensity care in multiple clinical scenarios. However, little is known about the effect of MHC upon clinicians’ decisions about intensifying antiglycemic medications in diabetic patients with poor glycemic control. We examined whether delay in intensification of antiglycemic medications in response to an elevated Hemoglobin A1c (HbA1c) value is longer for patients with MHC than for those without MHC, and whether any such effect varies by specific MHC type.
In this observational study of diabetic Veterans Health Administration (VA) patients on oral antiglycemics with poor glycemic control (HbA1c ≥8) (N =52,526) identified from national VA databases, we applied Cox regression analysis to examine time to intensification of antiglycemics after an elevated HbA1c value in 2003–2004, by MHC status.
Those with MHC were no less likely to receive intensification: adjusted Hazard Ratio [95% CI] 0.99 [0.96-1.03], 1.13 [1.04-1.23], and 1.12 [1.07-1.18] at 0–14, 15–30 and 31–180 days, respectively. However, patients with substance use disorders were less likely than those without substance use disorders to receive intensification in the first two weeks following a high HbA1c, adjusted Hazard Ratio 0.89 [0.81-0.97], controlling for sex, age, medical comorbidity, other specific MHCs, and index HbA1c value.
For most MHCs, diabetic patients with MHC in the VA health care system do not appear to receive less aggressive antiglycemic management. However, the subgroup with substance use disorders does appear to have excess likelihood of non-intensification; interventions targeting this high risk subgroup merit attention.
The drive to “cross the quality chasm”  toward better health care for all Americans has drawn attention to variability in processes of health care as a contributor to variability in outcomes . Adherence to process of care standards for diabetes  (such as guidelines regarding maintenance of good glycemic control) can reduce the toll of diabetes on health [4, 5]. However, clinicians do not consistently intensify antiglycemic medications in those with poor glycemic control . While sometimes appropriate,  causes of non-intensification require inquiry. Mental health condition (MHC) comorbidity could be one cause.
There are several reasons to anticipate that clinicians might respond less aggressively to poor glycemic control in patients with MHC. Adherence concerns, communication barriers caused by clinical manifestations of the MHC, time constraints posed by clinical complexity, or bias towards patients perceived as “difficult” could foster non-intensification . Indeed, MHC-related quality gaps have been documented in diabetes management related to monitoring of the patient, level of glycemic control, or receipt of antiglycemic medications [9–14]. However, we are aware of only one prior study that examines effect of MHC upon clinicians’ decisions about intensification of antiglycemic medications following an elevated Hemoglobin A1c (HbA1c) value . It is important to determine if decisions about whether to intensify antiglycemic medications contribute to the previously documented tendency for patients with MHC to have disproportionately poor glycemic control [9, 16].
The Veterans Health Administration (VA) is an excellent setting in which to examine this issue. It is the largest integrated healthcare system in the United States, with comprehensive electronic medical records. Mental illness is more common in VA than in the general U.S. population, [17–21] as is diabetes . VA’s performance on diabetes quality measures has improved substantially since tracking began in 1995 . However, individual-level variability persists in glycemic control (measured with HbA1c tests), putting patients at risk of adverse diabetes outcomes. MHC-related differences in intensity of diabetes care could contribute to such variability.
We studied a national cohort of diabetic patients treated with oral antiglycemic agents in VA, asking:
After an elevated HbA1c value (poor glycemic control), is delay in antiglycemic medication intensification longer for patients with MHC than for those without MHC?
Does any such effect vary by MHC type?
Overview and data sources
In this observational study, the study cohort was derived from the Diabetes Epidemiology Cohorts (DEpiC) database, a validated, cumulative census of all diabetic VA patients . Data came from VA’s National Patient Care Database (NPCD) and Decision Support System (DSS).
We examined differences in antiglycemic intensification for patients with versus without MHC managed with oral antiglycemics who had suboptimal glycemic control. We identified an elevated HbA1c value (“index HbA1c”) occurring during a one-year Observation Interval (OI) from April 1, 2003 through March 31, 2004, and examined intensifications of antiglycemics in the 180 days following the index HbA1c, i.e., in the period ending as late as September 30, 2004. This study was approved by Stanford University’s Administrative Panels for the Protection of Human Subjects.
See Table 1 for details of cohort construction. DEpiC identified veterans as having diabetes as of the first day of fiscal year 2003 based on receipt of VA antiglycemic treatment in the prior year, or based on at least two instances of VA/Medicare International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) diagnosis codes (250.00-250.93, 357.2, 362.0-362.02) in the prior two years . The study cohort was drawn from DEpiC members who received oral antiglycemics from VA at least once during the 6 months pre-OI, used VA outpatient care in the prior year, and were alive on the first day of the OI. We excluded institutionalized patients (the focus was upon outpatient diabetes management) and patients with serious conditions likely to alter goals of care (the focus was upon patients eligible for routine intensification). For complete lab data capture, we excluded patients whose home VA facility did not submit HbA1c data consistently to DSS, the central data repository. This step retained data for 125 facilities (86%) and retained nearly identical proportions of patients with and without MHC.
Finally, among patients with at least one HbA1c test completed during the OI, we identified patients eligible for intensification as those with at least one “qualifying” HbA1c value ≥8.0 [15, 24] during the OI. An elevated HbA1c value was considered to be a qualifying value if no antiglycemic intensification had occurred in the prior 3 months (since a clinician might not elect to intensify if treatment was changed recently) and if no hospitalization had occurred in the prior 3 months (since a clinician might not intensify if the value reflected transient effects of an acute inter-current illness or if treatment was altered during an inpatient stay) and if the HbA1c test was not obtained on a hospital admission day (for a similar reason). In addition, a HbA1c test was only considered to be a qualifying value if it was not preceded by any insulin prescription in the prior six months. The rationale for this additional requirement was that modifications to insulin dose sometimes are communicated verbally and not recorded, so intensifications in insulin dose cannot be detected reliably. The cohort was therefore composed of patients managed exclusively on oral agents at baseline.
Like others, [15, 24] we selected a threshold of 8.0 for HbA1c. In the calendar period being examined, VA guidelines recommended a risk stratification approach with targets varying based upon comorbidities and life expectancy . The goal of this study was not to assess quality of diabetes care in VA, for which a lower HbA1c threshold would apply to many patients with diabetes. Instead the goal was to examine differences in management as a function of MHC status among patients having a clear indication for intensification, i.e., in patients not meeting even the conservative threshold of HbA1c <8.0, which would apply to most individuals with diabetes.
Among the 66,798 patients meeting all these criteria, we excluded the 12.6% with indeterminate MHC status (n = 8,434; MHC Indeterminate group not shown in Table 1), defined below. There were thus 58,364 patients who met all study criteria. For each of them, we randomly selected one eligible high HbA1c value within the OI as the “index HbA1c”, with the intent to identify intensification occurring in the 180 days following that index HbA1c. After reserving a randomly-selected 10% of patients for exploratory, model development analyses, the remaining 90% represented the final analytic cohort (n = 52,526; 10,422 MHC Yes and 42,104 MHC No).
Independent variable: MHC
We used the Agency for Healthcare Research and Quality’s Clinical Classifications Software, with minor modifications, to map ICD-9-CM codes uniquely to ten specific MHCs: depressive disorders, posttraumatic stress disorder (PTSD), other anxiety disorders, adjustment disorders, psychotic disorders, bipolar disorders, substance use disorders, personality/conduct/impulse control disorders, psychogenic disorders, and other mental health conditions. ICD-9-CM code specifications are provided in the Additional file 1. A patient was considered “MHC Yes” if he/she had at least one instance of an MHC ICD-9-CM code in the two years pre-OI, plus a confirmatory code during the OI. This ensured MHC was present before the index HbA1c and ongoing during the OI; requiring the confirmatory code improves robustness of the MHC measure . Patients with no MHC ICD-9-CM in the three-year period were “MHC No.” All others (i.e., those with an MHC ICD-9-CM code in the two years pre-OI or during the one year OI, but not both) were “MHC Indeterminate” and were excluded. This allowed direct comparisons between two sharply delineated groups (MHC Yes versus MHC No), enhancing specificity of MHC status classification.
Separate indicator variables were created for each specific MHC. For example, a patient was considered to have “depressive disorder Yes” if he/she had at least one instance of a depressive disorder ICD-9-CM code at baseline and at least one confirmatory code during the OI (versus no instance of depressive disorder in the three-year period). Since an individual could have more than one specific MHC, the same patient could have had a positive indicator variable for another MHC such as PTSD as well.
Dependent variable: intensification
An intensification was considered to have occurred during the 180 days following the index HbA1c if (a) total daily dose of oral antiglycemic medication (unit dose × quantity issued ÷ days supply) was higher than total daily dose at the time of the most recent prior prescription, (b) a new oral antiglycemic was issued, or (c) insulin was issued, based on VA pharmacy data. (Note: While changes to insulin dose may not be detected reliably in pharmacy data, such new insulin prescriptions should be.) An oral antiglycemic was “new” if time from end date of the most recent prior prescription of that medication to start of the next prescription of that medication exceeded 6 months: issuing a medication—even at the same or lower dose—following a lapse in therapy indicates active management efforts by the clinician. We linked each index high HbA1c value date to the dates of the most recent prior intensification and the most recent subsequent intensification, if any.
Competing variables/censoring variables
Following the index high HbA1c, a subsequent HbA1c <8.0 was treated as a competing event . VA hospitalizations (admission dates), death, and no event prior to end of OI were treated as right-censoring.
Age, sex and race/ethnicity came from NPCD. Physical Comorbidity Index is a count of 36 common, non-psychiatric medical conditions developed for VA outpatient case mix adjustment . This, and variables for specific macrovascular or microvascular conditions, were derived from ICD-9-CM codes in the two years pre-OI. Count of primary care visits in the year pre-OI was identified using clinic type codes.
Descriptive cohort characteristics
In the analytic cohort, we calculated sample means or percentages for sociodemographic characteristics, health status, and index HbA1c value, for patients with any MHC and for those with no MHC.
Bivariate associations: MHC status and intensification or first event type
Using cross-tabulations, we summarized associations between MHC status (yes/no) and intensification within 14 days or within 30 days post index HbA1c, and between MHC status and each of the following as a first event during the OI: intensification, HbA1c <8, hospitalization, death and none of these.
Main analyses: MHC status and intensification
In developing our model, we used the 10% random sub-sample to assess whether assumptions of Cox regression were met . Then, in the 90% random sub-sample, we used the fitted Cox regression model to test for association between time to intensification (i.e., days from the date of the index elevated HbA1c test to the date that antiglycemic intensification first occurred) and MHC status (MHC Yes versus MHC No). Our model treated hospitalization, death and end of the OI without an event as right censorings. The model controlled for possible confounders, selected a priori based on the literature: sociodemographic characteristics of age and sex (race/ethnicity was not included due to missingness), health status (Physical Comorbidity Index and macrovascular/microvascular complications of diabetes), glycemic severity (index HbA1c value), and facility level clustering (125 facilities as fixed effects using 124 dummy variables). With the large sample size (n = 52,526), statistical power was more than adequate for detecting clinically meaningful effect sizes.
To meet the linearity assumption, we conducted logarithmic transformation of the Physical Comorbidity Index. To meet the proportional hazards assumption for MHC status, age and microvascular complications, we performed interval-specific analyses,  dividing the 180 days following the index HbA1c into three periods: 0–14, 15–30, and 31–180 days post index HbA1c. These periods are clinically meaningful: allowing time for the clinician to receive the lab result, it would be desirable for clinicians to respond to an abnormal lab promptly within two weeks (consistent with the 0–14 day interval), but if an appointment needed to be scheduled to review the results, it could have taken a month to bring the patient in to the office to discuss treatment options (consistent with the 15–30 day interval). Intensifications occurring more than a month after the elevated HbA1c may have been occurring at routine visits not scheduled for the specific purpose of reviewing the test result. We fit the model separately to all patients who had not yet experienced an event during each of these three sequential time periods. In the first two time periods, we treated a subsequent HbA1c <8.0 as a right censoring event, due to the small number of such events (0.1% and 0.2%, respectively). In the last model (31–180 days), we treated a subsequent below-threshold HbA1c value as a competing event; we postulated that once HbA1c <8.0 occurred, a search for subsequent intensification was no longer necessary. For all models, attainment of the end of the time period of interest without an event was treated as an administrative right censoring event.
Reported parameter estimates are from the fit to the 90% sample. From the covariate-adjusted Cox regression models, primary parameter values of interest were hazard ratios (HR), estimated for intensification as a function of MHC status. We also estimated cumulative incidence functions,  separately by MHC status (yes/no) and time period (0–14, 15–30, 31–180 days), with all covariates set to their sample means. Cumulative incidence functions were estimated for the below-threshold HbA1c value competing event for 31–180 days only.
Secondary analyses: specific MHCs and intensification
We then repeated the same Cox regression analysis except that we included ten binary indicator variables for the ten most prevalent specific MHCs (depressive disorders, PTSD, other anxiety disorders, adjustment disorders, psychotic disorders, bipolar disorders, substance use disorders, personality or conduct/impulse control disorders, psychogenic disorders, and other MHCs) in a single model, making it possible to examine the distinct contribution of each individual MHC in the context of any other comorbid MHCs. We estimated HRs for each of these common MHCs, for each of the three time intervals.
Descriptive cohort characteristics
In the analytic cohort, 10,422 patients had MHC, and 42,104 had no MHC. Sample mean (SD) age was 58.3 (9.4) and 65.4 (10.6) years, respectively (p <0.001). Sample mean (SD) number of primary care visits in the 365 days before the index HbA1c was 4.3 (3.6) and 3.4 (2.7), respectively (p <0.001). Table 2 shows estimates for patient characteristics, by MHC status. The most common specific MHCs were depressive disorders (9.7%), PTSD (6.1%), other anxiety disorders (2.5%), adjustment disorders (0.5%), psychotic disorders (2.5%), bipolar disorders (1.2%), substance use disorders (2.4%), personality or conduct/impulse control disorders (0.4%), psychogenic disorders (0.2%) and all other MHCs (0.2%). Among patients with any MHC, 7,131 (68.4%) had exactly one of the 10 specific MHCs examined; others had at least two of these MHCs.
Bivariate associations: MHC status and intensification or first event type
Intensification occurred within 14 days for 39.0% of patients with MHC and 37.9% of those without MHC, and within 30 days for 46.3% and 44.2%, respectively (Table 3). Intensification was the first event after the index high HbA1c for an estimated 64.7% and 61.0%, respectively. HbA1c <8.0 was the first event for 9.6% and 9.8%, respectively. Hospitalization was the first event for 4.3% and 2.1%, respectively; <1% of hospitalizations were for indications potentially proximately related to level of glycemic control, e.g., hospitalizations for hyperglycemia or hypoglycemia.
Main analyses: MHC status and intensification
No difference was detected in rate of intensification in the first 14 days after a high HbA1c value between patients with versus without MHC, after controlling for patient characteristics and facility (HR 0.99) (Table 4). Patients with MHC were estimated to experience a somewhat higher rate of intensification of antiglycemic medications than were those without MHC during the 15–30 and the 31–180 days following a high HbA1c (HR 1.13 and HR 1.12, respectively).
While not a focus of this paper, it is noteworthy that in each time interval following an elevated HbA1c value, older patients were estimated to experience a somewhat lower rate of intensification than younger patients. No independent effect of patient sex was identified, though the number of women was relatively small. Not surprisingly, patients with progressively worse glycemic control in general were estimated to experience a progressively higher rate of intensification than patients with better glycemic control.These patterns related to MHC were also evident in the estimated cumulative incidence functions. That is, during the later two time periods, intensification events accumulated more rapidly for those with MHC than for those with no MHC (Figure 1).
Secondary analyses: specific MHCs and intensification
As Table 5 shows, we detected a higher rate of intensification among patients with depressive disorders at 15–30 days (HR 1.21, CI 1.08-1.36) and at 31–180 days (HR 1.12, CI 1.04-1.21), versus those with no depressive disorder. Similarly, we saw a higher rate of intensification among patients with psychogenic disorders versus those with no psychogenic disorder, at 31–180 days (HR 1.79, CI 1.21-2.64). In contrast, rate of intensification was estimated to be lower for patients with substance use disorders at 0–14 days (HR 0.89, CI 0.81-0.97) versus those without substance use disorders. Other differences for specific MHCs were not statistically significant.
Contrary to our hypothesis, we found diabetic patients with mental health conditions were no less likely to receive intensification of antiglycemic medications in response to an elevated HbA1c value than were those without MHC. Indeed, among diabetic patients who did not receive intensification within the first two weeks following a high HbA1c value, those with MHC were marginally more likely than those with no MHC to receive intensification. A similar effect appeared to hold for depressive disorders and, in the 31–180 days following an elevated HbA1c value, for psychogenic disorders. In contrast, patients with substance use disorders were less likely than those with no substance use disorder to receive intensification in the first two weeks following a high HbA1c value, controlling for sex, age, medical comorbidity, other specific MHCs, index HbA1c value, and facility.
These findings reinforce mounting evidence that the relationship between MHC and intensity of medical care might be more complex than initially appeared. Multiple studies have concluded that patients with MHC receive less intensive medical care. This has been seen for processes and intermediate outcomes of care in a range of conditions, from cardiovascular disease [13, 31] to preventive care  to diabetes [9–12, 33]. Despite consistency of such findings, null effects and counter-effects have also been appearing in the literature [14, 15, 34–36].
What might account for this inconsistency? One factor may be that MHCs represent a heterogeneous group of clinically distinct conditions. Many studies aggregate MHCs, reducing ability to detect more granular effects. In studies that do distinguish between different MHCs, substance use disorders frequently emerge as drivers of low intensity care [9, 10]. Such was the case in our study as well: we estimated a lower rate of antiglycemic intensification in the first two weeks after a high HbA1c among patients with substance use disorders. While our study was not designed to identify mechanisms, this finding could reflect patient non-adherence leading clinicians to advise patients to use the currently-prescribed dose more regularly,  patients’ failure to attend scheduled follow-up appointments to discuss medication modifications,  clinician concerns about risk of hypoglycemia related to drug interactions or unreliable timing of medication intake,  or clinician bias leading to altered prescribing patterns .
Another potential contributor to observed inconsistency between studies examining medical care intensity for patients with MHC relates to differences in how care intensity was measured. Some prior studies focused on factors like level of glycemic control, which might be sensitive to patient behaviors outside the medical visit. In contrast, medication intensification, the focus of our study, may be more responsive to health care utilization patterns . In our study, patients with MHC used primary care services more heavily in the year before the index HbA1c value; assuming such utilization patterns continued following the index HbA1c value, the patients with MHC might have had more opportunities to receive medication intensification. We found patients with and without MHC were equally likely to receive intensification in the first two weeks after a high HbA1c but that patients with MHC were more likely to receive intensification thereafter. This could mean that in the absence of a prompt response to a high HbA1c, clinicians are more liable to take action in patients they see more frequently. The observation that patients with more physical comorbidity were similarly more likely to receive intensification at 31–180 days – as were patients with psychogenic disorders -- bolsters this supposition.
Still another potential contributor to our finding that presence of MHC did not reduce a patient’s chances of antiglycemic intensification could relate to treatment of the MHC itself, especially in a setting like VA where mental health services are available at every medical center. The clinical presentation of patients with treated MHC (i.e., with good MHC symptom control) could resemble that of patients without MHC, attenuating differences in intensification. Indeed, treating MHC can result in improved medical outcomes .
This study has several strengths. First, it includes essentially the universe of diabetic patients on VA-prescribed oral agents with poor glycemic control, making findings more representative than would be possible in studies examining a specific setting or using primary data collection methodologies. Second, care was taken to identify sharply drawn cohorts of patients with and without MHC, reducing misclassification risk. Third, this study examines a range of MHCs and thus complements the one similar study we are aware of, which focused on depression . Fourth, the longitudinal analysis approach, which accounted for competing and censoring events, allowed for more robust conclusions because the temporally dynamic nature of patient status was taken into account.
Despite these strengths, findings in this study must be interpreted subject to several caveats. First, this study used existing data. This could have led to incomplete capture of intensifications, if verbal dosage changes were not promptly recorded or if some patients received supplemental prescriptions outside VA, although VA medication pricing structures would generally make this less likely. Nonpharmacological treatments (lifestyle modification counseling) likewise would not be captured in these data, although VA encourages such counseling for all patients with diabetes. Use of existing data also could have led to under-ascertainment of MHC,  although VA requires routine screening for depression, PTSD and alcohol use disorder; like this study, many studies examining quality of care for patients with MHC use ICD-9-CM codes to identify MHCs [8, 31]. Models do not include an indicator for receipt of psychiatric medications, some of which can worsen glycemic control and which would therefore be expected to increase clinicians’ vigilance about monitoring glycemic state and responding to above-target HbA1c values. Severity of MHC likewise is not captured, and models do not control for patient preferences (not available in these databases). Second, our study examined intensifications. If a patient was nonadherent to a previously-prescribed medication, the provider would appropriately focus on adherence, rather than dose escalation. Third, comorbidities were set to their baseline value (present/absent) rather than treating them as time-dependent variables. Any bias thus introduced  should be small, since new onset of chronic conditions during the narrow OI is expected to be low. Fourth, events have been modeled as non-terminal competing events,  focusing on time to first event. This approach was appropriate to the study question examining clinical reactions proximal to an elevated HbA1c, but does not capture subsequent events. Fifth, the OI for this study ended in 2004. Diabetes management guidelines regarding target HbA1c value have evolved since then, so absolute rates of intensification in reaction to an elevated HbA1c may not entirely reflect current practice. However, the focus of this study was not upon absolute rates but rather upon differences in how clinicians react to patients with and without MHC, much less likely to have evolved over this time period. Sixth, the study sample came from all diabetic patients in VA who were being managed exclusively on oral antiglycemics. Because we excluded those who received any insulin during the prior six months, our cohort, while focusing on poorly-controlled diabetes, may have tended to exclude those with particularly labile glycemic control. The study sample is substantially smaller than the base cohort, but that is largely because the research question is only clinically relevant to those with elevated HbA1c. Seventh, 90% of patients with MHC and 85% of those without MHC received HbA1c testing, and thus had an opportunity to have poor glycemic control detected, if present. However, this study did not capture the relatively small group with no HbA1c testing—this may have represented patients with relatively stable diabetes (who did not need to be tested as frequently), patients not being carefully monitored, patients who did not go to the lab to complete an ordered HbA1c test, or patients receiving most of their care outside of VA. Finally, since the VA has strong systems of care for both medical and mental health conditions, study findings might not be generalizable to veterans not using VA, or to non-veterans. Results from this predominantly male sample also may not generalize to women.
Our findings offer a mixed message. On one hand, it is reassuring that antiglycemic medication management appears to be at least as intensive for patients with MHC as for those without MHC, especially for depression, one of the most common MHCs in the United States . On the other hand, less than half of patients received intensification in the first month after a high HbA1c. While antiglycemic intensification is sometimes clinically inappropriate even for a substantially elevated HbA1c, this study of 2003-2004 care does raise the possibility of room for performance improvement independent of mental health comorbidity status, consistent with studies documenting “clinical inertia” in many health care settings [4, 6, 46]. Furthermore, the subgroup with substance use disorders may be at risk for less intensive antiglycemic care, which may or may not be appropriate, depending on the clinical scenario. Clinicians should carefully consider the appropriate response to an elevated HbA1c value, particularly in patients with substance use disorders. Future studies should examine the potential benefits of interventions specifically targeting diabetes management in this subgroup, such as collaborative care models between primary care providers and specialty substance use disorder treatment providers, or primary care medical home models that include embedded mental health professionals [47, 48].
Competing event analysis
Diabetes epidemiology cohorts
Decision support system
International classification of diseases 9th revision – clinical modification
Mental health condition
National patient care database
Observation interval (April 1, 2003 through March 31, 2004)
Posttraumatic stress disorder
Veterans health administration.
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The pre-publication history for this paper can be accessed here:http://0-www.biomedcentral.com.brum.beds.ac.uk/1472-6963/14/458/prepub
This material is based upon work supported by National Institutes of Health NIDDK 1 R01 DK071202-01, and by Department of Veterans Affairs, Health Services Research and Development Service (RCD 98–312, RCS 90–001, HFP 85–026, and IIR 04–248) and Clinical Science Research and Development Service (Epidemiology section) funds. The views expressed in this article are those of the authors and do not necessarily represent the views of the Department of Veterans Affairs.
No author has a financial interest or other dual commitment relevant to this manuscript. All authors are Department of Veterans Affairs (VA) employees or receive salary support from VA. The authors declare that they have no competing interests.
SF: Wrote the manuscript, and oversaw the study (including design and analysis). TH: Wrote major portions of the Methods section, contributed to the variable development approach, contributed to study design, contributed to database development approach, led the statistical analysis approach, interpreted findings, and critically edited the full manuscript. EB: Conducted the analyses and contributed to the analysis approach, synthesized output, contributed to database development approach, contributed to interpretation of findings, contributed to the Results section, and critically edited the full manuscript. MG: Contributed to study design, contributed to the variable development approach, contributed to the analysis approach, contributed to interpretation of findings, interpreted findings, contributed to the Discussion section, and critically edited the full manuscript. DB: Contributed to study design, contributed to the variable development approach, contributed to the analysis approach, interpreted findings, contributed to the Background and Discussion sections, and critically edited the full manuscript. DM: Contributed to study design, contributed to the variable development approach, contributed to the analysis approach, interpreted findings, contributed to Discussion and to presentation of Results and Tables, and critically edited the full manuscript. LP: Contributed to study design, contributed to the variable development approach, contributed to the analysis approach, interpreted findings, contributed to the Methods and Discussion sections, and critically edited the full manuscript. KL: Contributed to the variable development approach, contributed to analysis approach, contributed to interpretation of findings, contributed to the Background and Methods sections, and critically edited the full manuscript. TL: Contributed to the variable development approach, contributed to interpretation of findings, contributed to the Methods section, and critically edited the full manuscript. RM: Contributed to the analysis approach, contributed to the variable development approach, interpreted findings, contributed to all sections of the manuscript, and critically edited the full manuscript. All authors have approved the final version of this manuscript.
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Frayne, S.M., Holmes, T.H., Berg, E. et al. Mental illness and intensification of diabetes medications: an observational cohort study. BMC Health Serv Res 14, 458 (2014) doi:10.1186/1472-6963-14-458
- Psychiatric diagnosis
- Diabetes mellitus/therapy
- Health care delivery
- Hypoglycemic agents/therapeutic use
- Health services research