Impact of patient characteristics on the risk of influenza/ILI-related complications

Table 2 Predictors of Influenza-Related Complications and Hospitalizations

		Type of Complication
		Hospitalization (N = 103)			Any Complication (N = 1,545)
	Episodes	N	%	RR ^*	N	%	RR ^*
Female	3,595	58	1.6	1.1	841	23.4	1.0
Male	3,035	45	1.5	-	704	23.2	-
Age
<5	1,221	11	0.9	0.6	347	28.4	1.3
5–14	1,632	8	0.5	0.3	344	21.1	1.0
15–24	589	2	0.3	0.2	123	20.9	1.0
25–34	729	7	1.0	0.6	149	20.4	1.0
35–44	975	15	1.5	-	210	21.5	-
45–54	806	18	2.2	1.5	165	20.5	1.0
55–64	508	27	5.3	3.5	139	27.5	1.3
65+	170	15	8.8	5.7	68	40.0	1.9
Concurrent Conditions
Prior Immunization
Yes	160	11	6.9	4.8	48	30.0	1.3
No	6,470	92	1.4	–	1497	23.1	–
Recent Complication or Comorbidity
Yes	1,430	62	4.3	5.5	472	33.0	1.6
No	5,200	41	0.8	–	1073	20.6	–
Concurrent Dispensing of Amantadine or Rimantadine
Yes	267	3	1.1	0.7	66	24.7	1.1
No	6,363	100	1.6	-	1479	23.2	-
Prior Influenza Episode
Yes	389	3	0.8	0.5	92	23.7	1.0
No	6,241	100	1.6	-	1453	23.3	-
Quintile of 3-Month Preceding Health Care Cost
1:$0	1,436	10	0.7		273	19.0
2: >$0–$86	1,218	4	0.3	0.5	234	19.2	1.0
3:$87–$199	1,324	6	0.5	0.6	254	19.3	1.0
4: $200–452	1,326	16	1.2	1.7	346	26.1	1.4
5:$453+	1,326	67	5.1	7.2	438	33.0	1.7
Evidence of Medication Use and Prevalent Comorbid Conditions
Chronic Corticosteroid Use
Yes	29	6	20.7	14.1	16	55.2	2.4
No	6,601	97	1.5		1529	23.2
Malignancy
Yes	72	15	20.8	15.5	39	54.2	2.4
No	6,558	88	1.3	–	1506	23.0	–
Chronic Heart Disease
Yes	128	22	17.2	13.7	60	46.9	2.1
No	6,502	81	1.3	–	1485	22.8	–
Chronic Lung Disease
Yes	1,283	37	2.9	2.3	364	28.4	1.3
No	5,347	66	1.2	–	1181	22.1	–
Diabetes
Yes	116	14	12.1	8.8	50	43.1	1.9
No	6,514	89	1.4	–	1495	23.0	–

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