Table 3

Validation of Charlson comorbidity coding in the administrative database. Sensitivity, specificity, PPV and NPV with 95% CI of administrative data in identifying preoperative Charlson comorbidities, stratified by comorbidity type
n Sensitivity Specificity PPV NPV
Any Charlson comorbidity*
  Totalα 193

0.37

[0.31–0.44]

0.98

[0.96–0.99]

0.90

[0.82–0.95]

0.75

[0.71–0.79]

  Active at Admissionβ 70

0.63

[0.51–0.73]

0.93

[0.90–0.95]

0.55

[0.44–0.65

0.95

[0.92– 0.96]

Any malignancy
  Total 45 0.40 0.99 0.78 0.95
  Active 24 0.75 0.99 0.78 0.99
Cerebrovascular disease
  Total 7 0.29 0.99 0.40 0.99
  Active 0 N/A 0.99 0.00 1.00
Chronic pulmonary disease
  Total 70 0.21 1.00 0.88 0.90
  Active 7 0.29 0.97 0.12 0.99
Congestive heart failure
  Total 13 0.31 0.99 0.50 0.98
  Active 0 N/A 0.99 0.00 1.00
Diabetes w/complication
  Total 5 0.60 1.00 1.00 1.00
  Active 2 0.50 1.00 0.33 1.00
Diabetes w/o complication
  Total 30 0.57 1.00 0.89 0.98
  Active 14 0.43 0.98 0.32 0.99
Hemiplegia/paraplegia
  Total 2 0.00 1.00 0.00 1.00
  Active 1 0.00 1.00 0.00 1.00

α Denotes total number of patients with the specified comorbidity. 193 patients presented with at least 1 Charlson comorbidity. However, sum of patients with each comorbidity type does not equal 193 as patients may have > 1 Charlson comorbidity.

β Comorbidities stratified in chart review by activity on admission.

* No patients identified with AIDS or dementia.

Ma et al.

Ma et al. BMC Gastroenterology 2012 12:39   doi:10.1186/1471-230X-12-39

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