Incidence and Prognostic Factors for Legionnaires' Disease in Denmark 1993–2006

Table 5

Uni- and multivariable analyses of prognostic factors for confirmed, notified cases of Legionnaires’ disease, Denmark 1993–2006. 𝑁=1116.

Prognostic factor	No. of cases	No. (%) deaths	Univariable OR for death (95% CI)	Multivariable OR for death (95% CI)
Age group
<40 years	82	6 (7%)	1 (reference)	1 (reference)
40–59 years	487	59 (12%)	1.7 (0.7–4.2)	1.8 (0.7–4.5)
60–69 years	275	56 (20%)	3.2 (1.3–7.8)	3.0 (1.2–7.5)
70–79 years	199	62 (31%)	5.7 (2.4–14)	4.5 (1.8–11)
80+ years	73	33 (45%)	10 (4.0–27)	8.3 (3.1–22)
Gender
Male	735	141 (19%)	1 (reference)	1 (reference)
Female	381	75 (20%)	1.0 (0.8–1.4)	0.8 (0.6–1.1)
Comorbidity score
0	296	25 (8%)	1 (reference)	1 (reference)
1	309	46 (15%)	1.9 (1.1–3.2)	1.5 (0.9–2.6)
2	220	48 (22%)	3.0 (1.8–5.1)	2.0 (1.1–3.4)
3	143	44 (31%)	4.8 (2.8–8.3)	3.4 (1.9–6.0)
4	77	26 (34%)	5.5 (3.0–10)	3.3 (1.7–6.4)
5 or more	71	27 (38%)	6.7 (3.5–12)	3.5 (1.8–6.9)
Nosocomial
No	950	155 (16%)	1 (reference)	1 (reference)
Yes	166	61 (37%)	3.0 (2.0–4.3)	1.6 (1.0–2.3)
Travel-associated
No	814	194 (24%)	1 (reference)	1 (reference)
Yes	302	22 (7%)	0.3 (0.2–0.4)	0.4 (0.2–0.6)