Use of routine hospital morbidity data together with weight and height of patients to predict in-hospital complications following total joint replacement

Table 2 Characteristics of patients by obesity diagnosis as recorded in hospital morbidity data and by body mass index based on actual weight and height measured by nurse

Patient characteristic	Diagnosis of obesity as recorded in HMD¹		Body mass index calculated from weight and height measured by nurses from HIMS survey²
Patient characteristic	No obesity diagnosis N=793 (92.5%)	With obesity diagnosis N=64 (7.5%)	BMI 18.5-24.9 N=153 (18%)	BMI 25-29.9 N=488 (57%)	BMI > 30 N=216 (25%)
Age, mean (SD)	76.3 (4.6)	75.3 (4.3)	77.1 (4.8)	76.4 (4.6)	75.4 (4.4)!!
CCI, mean (SD)	1.2 (1.7)	2.3 (2.0)!	1.4 (2.0)	1.2 (1.6)	1.4 (1.7)
SES, %
Low	30%	27%	26%	28%	36%
Middle	32%	39%	30%	32%	33%
High	38%	34%	44%	39%	31%!
Yrs of smoking, mean (SD)	21.3 (19.8)	28.4 (19.2)!	19.3 (20.2)	21.9 (19.6)	23.4 (19.8)

! 0.001<p<0.05; !! p<0.001.
¹ Patients with an obesity diagnosis in HMD were compared with those who had no such diagnosis in HMD.
² Patients with BMI 25-29.9 or BMI > 30 were compared with those with BMI 18.5-24.9.
Abbreviations: CCI (Charlson Co-morbidity Index); SES (socioeconomic status according to distribution of Socio Economic indices For Areas (SEFA); Yrs (years)).

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