Table 1. Most common underlying medical conditions among Legionnaires’ disease case-patients, New York, New York, USA, 2002–2011*.

Condition	No. (%) case-patients	Relative risk (95% CI)†
Smoking history	879 (60.7)
COPD	223 (15.4)
Cancer	215 (14.8)
Diabetes
Overall	506 (34.9)
By age group, y†
18–24	1 (7.7)	6.3 (0.95–41.10)
25–44	31 (15.2)	5.7 (4.1–7.9)
45–64	208 (34.1)	2.5 (2.2–2.8)
>65	264 (42.8)	1.9 (1.7–2.0)

*n = 1,449. COPD, chronic obstructive pulmonary disease.
†For case-patients with diabetes only. Population denominators for diabetes prevalence are from the American Community Survey. Relative risks for children age <18 y (2/5 case-patients <18 had diabetes) were not calculated because population denominators were not available for this age group.