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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.