Investigating concordance in diabetes diagnosis between primary care charts (electronic medical records) and health administrative data: a retrospective cohort study

Table 3 Characteristics of 19442a patients identified in the EMR database between 1 April 2006 - 31 March 2008, stratified by diabetes diagnosis and sex

	Overall			Men		Women
% (unless otherwise indicated)	General N = 19442^a	DM^b N = 2180	Non-DM N = 17262	DM^b N = 1174	Non-DM N = 7868	DM^b N = 1006	Non-DM N = 9394
Males	46.5	53.9	45.6
Age (Mean)	42.5	45.0	42.5
Rurality	44.0	46.1	43.7	46.4	43.3	45.7	44.1
New Immigrant ^c	0.4	0.6	0.4	0.7	0.5	0.0	0.4
Income
Quintile 1-low	9.7	10.9	9.5	10.4	9.3	11.5	9.7
Quintile 5-high	32.0	30.6	32.2	30.3	32.2	31.0	32.1
Diagnoses
Diabetes on problem list	8.5	75.8	0.0	73.3	0.0	78.7	0.0
Diabetes complication problem list ^d	25.5	61.7	20.9	61.6	21.4	61.7	20.5
Polycystic ovary syndrome (PCOS)	0.1	0.0	0.1	0.0	0.0	0.4	0.2
Coronary Artery Disease (CAD)	4.7	14.0	3.5	16.7	4.6	11.0	2.6
Hypertension	16.5	43.0	13.2	42.2	12.3	44.0	13.9
Family History of Diabetes	6.8	14.2	5.9	9.9	4.2	19.2	7.2
Visits to Family Physician (Mean)	8.4	11.5	7.9	10.7	7.2	12.4	8.4
Prescribed Diabetes Medications ^e
Insulin Ever	1.7	15.4	0.0	16.1	0.0	14.6	0.0
Metformin Ever	6.6	52.9	0.7	53.9	0. 8	51.8	0.6
Oral hypoglycemic agents	4.7	40.4	0.1	42.3	0.0	38.1	0.2

^aDemographics missing for 1 patient; ^bDiabetes diagnosis using Definition 1.c.
^cNew immigrant - patients not eligible for provincial health insurance (OHIP) as of the study start date used as proxy to determine new immigrant status; ^dDiabetes related complication including: coronary artery disease, hypertension, chronic obstructive pulmonary disease, polycystic ovarian syndrome, dyslipidemia, stroke/transient ischemic attack, erectile dysfunction, cardiovascular disease; ^eOver a 2 year time period

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