Table 3

Separate models for predictors of qRT-PCR confirmed influenza infection and clinical influenza among included households.

Variable

RT-PCR confirmed Influenza

ILI


OR

95% CI

p-value

OR

95% CI

p-value


Intervention Group

Control Group

Ref.

Ref.

Mask Group

0.39

0.13-1.19

0.10

0.56

0.18-1.68

0.3

Mask & Hygiene Group

0.61

0.23-1.66

0.34

0.47

0.15-1.49

0.2

Intervention Groups combined

Control Group

Ref.

Ref.

Mask Group +

Mask & Hygiene Group

0.50

0.21-1.20

0.12

0.51

0.2-1.28

0.15

Sex*

Female

Ref.

Ref.

Male

1.2

0.62-2.28

0.52

0.65

0.3-1.42

0.28

Age*

Adult (> 14 yrs)

Ref.

Ref.

Child

1.52

0.71-3.23

0.28

2.22

0.97-5.08

0.06

Time spent at home*

< 18 hours/day

Ref.

Ref.

≥18 hours/day

3.1

1.3-7.33

0.01

3.98

1.34-11.77

0.01

Therapy of Index patient*

No timely therapy

Ref.

Ref.

Timely therapy

1.63

0.70-3.81

0.26

1.07

0.42-2.7

0.89

Vaccination of Contact*

No vaccination

Ref.

Ref.

Vaccination

0.62

0.11-3.56

0.6

0.48

0.06-3.94

0.49


Independent variables: (i) intervention group, (ii) intervention group (with pooled data of Mask- and Mask&Hygiene group), (iii) one separate model for each individual variable that may influence household transmission of influenza (i.e. age, sex, timely antiviral therapy of the index, vaccination of household contacts) adjusted for intervention group

OR Odds ratio, 95% CI 95% Confidence Interval

*Models also included intervention group as independent variable

Suess et al. BMC Infectious Diseases 2012 12:26   doi:10.1186/1471-2334-12-26

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