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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.