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Table 2 Association of selected characteristics with severe manifestations of H1N1 influenza

From: Risk factors associated with severe manifestations of 2009 pandemic influenza A (H1N1) infection in China: a case–control study

Risk factors

Univariate analysis

Multivariable analysis*

OR

95% CI

OR

95% CI

Age (years)

    

>5 and <60

1.00

 

1.00

 

≤5 or ≥60

12.35

4.87-31.32

21.14

7.79-57.33

Occupation

    

Others

1.00

 

1.00

 

peasant

15.82

8.89-28.16

9.79

5.11-18.78

Body mass index (kg/m 2 )

    

< 25.0

1.00

 

1.00

 

25.0~29.9

6.84

4.20-11.15

3.70

2.04-6.72

≥30.0

40.56

9.76-168.57

35.61

7.96-159.21

Chronic respiratory disease

    

No

1.00

 

1.00

 

Yes

32.78

4.44-241.79

42.98

5.24-352.55

Diabetes

    

No

1.00

 

1.00

 

Yes

21.18

2.83-158.70

25.51

3.06-212.75

Gender/pregnancy

    

Male

0.89

0.64-1.23

0.66

0.43-1.02

Female, no

1.00

 

1.00

 

Female, yes

21.05

7.47-59.34

8.43

2.68-26.58

Time from symptom onset to hospital admission (days)

    

≤2

1.00

 

1.00

 

>2

3.45

2.47-4.81

3.26

2.08-5.11

  1. * Logistic regression model, adjusting for other risk factors listed in the table simultaneously.