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Table 2 Obesity prevalence and the validity of hospital discharge abstract (DAD) administrative health database coding of (n = 17380)

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

  Prevalence in clinical registry, based on physical measure (n,%) Prevalence in DAD, coded as obese (n,%) Sensitivity Specificity NPV PPV (%, 95% CI)
Overall 3523 (20.27) 414 (2.38) 7.75 98.98 80.84 65.94 (61.38,70.51)
Year       
2002 607 (20.72) 85 (2.90) 8.24 98.49 80.41 58.82 (48.36, 69.29)
2003 517 (19.12) 80 (2.96) 9.48 98.58 82.16 61.25 (50.57, 71.93)
2004 564 (21.32) 67 (2.53) 8.69 99.14 80.02 73.13 (62.52, 83.75)
2005 499 (20.24) 42 (1.70) 5.81 99.34 80.6 69.05 (55.07, 83.03)
2006 466 (19.58) 39 (1.64) 6.44 99.53 81.38 76.92 (63.70, 90.15)
2007 443 (20.18) 41 (1.87) 5.87 99.14 80.64 63.41 (48.67, 78.16)
2008 427 (20.71) 60 (2.91) 9.37 98.78 80.67 66.67 (54.74, 78.59)
Age       
<55 950 (21.88) 105 (2.42) 7.58 99.03 79.27 68.57
55-65 1009 (21.93) 121 (2.63) 7.63 98.77 79.19 63.64
65-75 1023 (21.13) 118 (2.44) 8.02 99.06 80.08 69.49
> = 75 541 (15.04) 70 (1.95) 7.76 99.08 85.85 60.00
Gender       
Female 1535 (28.30) 198 (3.65) 9.84 98.79 73.52 76.26
Male 1988 (16.63) 216 (1.81) 6.14 99.06 84.11 56.48
Indication for coronary catheterization       
Stable angina 1015 (21.53) 129 (2.74) 8.77 98.92 79.81 68.99
Myocardial infarction 1312 (19.06) 163 (2.37) 7.85 98.92 82.01 63.19
Unstable angina 843 (22.75) 91 (2.46) 6.88 98.85 78.28 63.74
Other 353 (17.00) 31 (1.49) 6.52 99.54 83.87 74.19
Diabetes       
Not diabetic 2461 (17.94) 243 (1.77) 6.18 99.19 82.86 62.55
Diabetic 1062 (28.99) 171 (4.67) 11.39 98.08 73.05 70.76
Cerebrovascular disease       
No history of CVD 3258 (20.22) 375 (2.33) 7.49 98.98 80.85 65.07
History of CVD 265 (20.97) 39 (3.09) 10.94 99.00 80.73 74.36
Congestive heart failure       
Absent 3062 (20.35) 356 (2.37) 7.64 98.98 80.74 65.73
Present 461 (19.73) 58 (2.48) 8.46 98.99 81.48 67.24
Hypertension       
Non-hypertensive 974 (15.67) 119 (1.91) 7.80 99.18 85.27 63.87
Hypertensive 2549 (22.83) 295 (2.64) 7.73 98.86 78.36 66.78
Hyperlipidemia       
Hyperlipidemic 855 (17.74) 93 (1.93) 7.49 99.27 83.27 68.82
Non-hyperlipidemic 2668 (21.24) 321 (2.56) 7.83 98.87 79.91 65.11
Prior MI       
No history of MI 2664 (20.48) 302 (2.32) 7.43 98.99 80.59 65.66
Prior MI 859 (19.64) 112 (2.56) 8.73 98.95 81.60 66.96
  1. Abbreviations: NPV Negative Predictive Value, PPV Positive Predictive Value, CI Confidence Interval.