Table 4

Validation of Charlson comorbidity coding in the administrative database continued. 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
Mild liver disease
     Totalα 21 0.19 0.99 0.44 0.97
     Activeβ 6 0.33 0.99 0.22 0.99
Moderate/severe liver disease
     Total 5 0.40 1.00 0.50 0.99
     Active 4 0.50 1.00 0.50 1.00
Myocardial infarction
     Total 21 0.38 0.99 0.67 0.98
     Active 1 1.00 0.98 0.08 1.00
Peptic ulcer disease
     Total 11 0.27 0.99 0.50 0.99
     Active 3 1.00 0.99 0.50 1.00
Peripheral vascular disease
     Total 6 0.17 1.00 0.33 0.99
     Active 1 0.00 0.99 0.00 1.00
Renal disease
     Total 8 0.13 1.00 0.50 0.99
     Active 3 0.33 1.00 0.50 1.00
Rheumatoid arthritis or collagen disease
     Total 38 0.13 1.00 0.83 0.94
     Active 12 0.17 0.99 0.33 0.98

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.

Ma et al.

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

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