|
Characteristics
|
No. (median/mean)
|
Crude OR (95% CI)
|
P value
|
Adjusted OR (95% CI)
|
P value
|
|---|
|
Age per 10 years1
|
(29.2/31)
|
1.45 (0.71-2.93)
|
0.305
| | |
|
Male sex
|
18
|
0.69 (0.14-3.45)
|
0.654
| | |
|
Baseline anti-H1N1 titer2
|
(10.0/12.3)
|
0.36 (0.07-2.01)
|
0.245
| | |
|
High risk group3
|
40
|
3.34 (0.94-11.80)
|
0.061
|
6.51 (1.13-37.52)
|
0.036
|
|
Optimal surgical mask usage
|
75
|
3.39E8 (0.00-∞)
|
0.998
| | |
|
Optimal hand hygiene
|
83
|
3.00E8 (0.00-∞)
|
0.999
| | |
|
ILI episode
|
21
|
12.19 (3.23-46.04)
|
< 0.001
|
9.14 (2.02-41.36)
|
0.004
|
|
Virologically confirmed 2009 H1N1 infection4
|
9
|
11.41 (2.54-51.32)
|
0.002
|
5.99 (0.98-36.48)
|
0.052
|
- Abbreviations: OR, odds ratio; CI, confidence interval; ILI episode, influenza-like illness episode.
-
1 For every 10-year increase in age, for which integer values 0-3 denote ages of 20-30, 30-40, 40-50, and 50-60, respectively.
-
2 Unit increase in baseline titer, for which integer values 0-8 denote titers of < 10, 10, 20, 40, 80, 160, 320, 640, and 1280 or more, respectively.
-
3 HCWs in direct contact with patients with 2009 pandemic influenza A (H1N1) infection or their respiratory samples were designated high-risk group.
-
4 Virologically confirmed means either viral isolation or real time polymerase chain reaction was positive of 2009 H1N1 influenza virus.
