Coding of obesity in administrative hospital discharge abstract data: accuracy and impact for future research studies

Table 4 The impact of obesity on one-year outcomes

Comparison groups	Odds ratio (95%CI)*
	Re-hospitalization	CABG or PCI	Mortality
Obese by DAD data only (non-obese n = 16966, obese n = 414)	0.84 (0.68, 1.03)	2.26 (1.77, 2.88)	0.74 (0.42, 1.32)
Obese by physical measurement and DAD (non obese = 17107, obese n = 273)	0.90 (0.70, 1.15)	2.81 (2.07, 3.81)	0.60 (0.28, 1.30)
Obese by physical measurement only (non-obese n = 14130, obese 3250)	0.84 (0.78, 0.91)	1.20 (1.10, 1.31)	0.62 (0.49, 0.78)
Obese by physical measurement or DAD (non-obese n = 13857, obese 3523)	0.83 (0.77, 0.90)	1.22 (1.12, 1.32)	0.63 (0.51, 0.79)

Obesity classified by data source: hospital discharge abstract (DAD) administrative health database and clinical registry physical measurement (N = 17380).
*Adjusted for sex, age group (by decade), and co-morbidity (0, 1-4, or ≥ 5 of chronic obstructive pulmonary disease, cerebrovascular disease, renal disease, congestive heart failure, dialysis, hypertension, hyperlipidemia, previous myocardial infarction, peripheral vascular disease, and diabetes).

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