Postoperative complications following colectomy for ulcerative colitis: A validation study

BMC Gastroenterology

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 ^*
Total^α	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 Admission^β	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.

ISSN: 1471-230X