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Table 1 Baseline characteristics of the study population from clinical registry data (APPROACH)

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

  Overall cohort Obese by measured data Obese by administrative data
  Number of subjects (n) Mean BMI (kg/m2) (±SD) Number of subjects (n) Mean BMI (kg/m2) (±SD) Number of subjects (n) Mean BMI (kg/m2) (±SD)
Total 17380 29.96 ± 4.14 3523 32.84 ± 2.96 414 31.38 ± 4.57
Age       
<55 4341 27.24 950 32.93 ± 2.96 105 31.34 ± 4.30
55-65 4600 27.27 1009 32.79 ± 3.08 121 31.30 ± 4.93
65-75 4842 27.06 1023 32.75 ± 2.82 118 31.49 ± 4.80
> = 75 3597 26.11 541 32.94 ± 3.00 70 31.42 ± 4.00
Gender       
Female 5424 27.28 1535 33.72 ± 3.33 198 32.79 ± 4.88
Male 11956 26.82 1988 32.16 ± 2.43 216 30.10 ± 3.86
Indication for coronary catheterization       
Stable angina 4715 27.26 1015 32.75 ± 2.65 129 31.79 ± 3.35
Myocardial infarction 6883 26.86 1312 32.78 ± 3.05 163 31.32 ± 4.52
Unstable angina 3705 27.20 843 32.96 ± 3.08 91 30.50 ± 5.40
Other 2077 26.23 353 33.02 ± 3.15 31 32.64 ± 6.14
Diabetes       
Not diabetic 13717 26.70 2461 32.70 ± 2.86 243 30.99 ± 4.34
Diabetic 3663 27.94 1062 33.16 ± 3.15 171 31.95 ± 4.85
Cerebrovascular disease       
No history of CVD 16116 26.98 3258 32.84 ± 3.00 375 31.24 ± 4.53
History of CVD 1264 26.72 265 32.77 ± 2.48 39 32.75 ± 4.85
Congestive heart failure       
Absent    3062 32.78 ± 2.87 356 31.38 ± 4.40
Present    461 33.22 ± 3.49 58 31.41 ± 5.58
Hypertension       
Non-hypertensive 6215 26.38 974 32.64 119 31.48
Hypertensive 11165 27.29 2549 32.91 295 31.34
Hyperlipidemia       
Hyperlipidemic 4820 26.32 855 32.90 ± 2.90 93 31.85 ± 5.01
Non-hyperlipidemic 12560 27.21 2668 32.82 ± 2.98 321 31.25 ± 4.44
Prior MI       
No history of MI 13007 26.97 2664 32.84 ± 2.97 302 31.53 ± 4.40
Prior MI 4373 26.96 859 32.83 ± 2.92 112 31.00 ± 5.01
  1. Abbreviations: SD Standard Deviation, Obesity BMI ≥30 kg/m2, Obesity Class II BMI ≥35 kg/m2, Obesity Class III BMI ≥ 40 kg/m2.