Table 1.

Comorbid conditions and weights used to derive the Charlson comorbidity index

Comorbid Medical Condition	Charlson weight	N	% of sample
Diabetes without end-organ damage	1	256	27
Peripheral vascular disease	1	230	24
Congestive heart failure	1	200	21
Rheumatological disease	1	176	19
Chronic pulmonary disease	1	158	17
Cerebrovascular disease	1	151	16
Peptic ulcer disease	1	98	10
Diabetes with end-organ damage	2	106	11
Moderate/severe renal disease	2	131	14
Any tumor, leukemia, or lymphoma	2	27	3
Moderate/severe liver disease	3	13	1
Metastatic tumor	6	3	0.3
HIV-positive	6	1	0.1

Myocardial infarction and dementia not collected because they were exclusion criteria