Table 5

Multivariable analysis for predictors of qRT-PCR confirmed influenza infection and clinical influenza among included households in separate models allowing for within household correlation.

Variable

RT-PCR confirmed Influenza

ILI


OR

95% CI

p-value

OR

95% CI

p-value


Complete

Data

Intervention Group*

Control Group

Ref.

Ref.

Mask Group

0.3

0.1-0.94

0.04

0.5

0.2-1.6

0.3

Mask & Hygiene Group

0.59

0.2-1.5

0.3

0.49

0.2-1.6

0.2

Intervention Groups combined*

Control Group

Ref.

Ref.

Mask Group +

Mask & Hygiene Group

0.45

0.2-1.1

0.07

0.5

0.2-1.3

0.2

2009/2010

Intervention Group*

Control Group

Ref.

Ref.

Mask Group

0.21

0.03-1.4

0.1

0.7

0.13-3.4

0.6

Mask & Hygiene Group

0.21

0.04-1.09

0.06

0.5

0.09-2.2

0.3

Intervention Groups combined*

Control Group

Ref.

Ref.

Mask Group +

Mask & Hygiene Group

0.21

0.05-0.9

0.04

0.53

0.14-2.08

0.4

2010/2011

Intervention Group*

Control Group

Ref.

Ref.

Mask Group

0.32

0.07-1.49

0.15

0.4

0.06-2.3

0.3

Mask & Hygiene Group

0.94

0.25-3.5

0.9

0.51

0.09-3.3

0.5

Intervention Groups combined*

Control Group

Ref.

Ref.

Mask Group +

Mask & Hygiene Group

0.6

0.2-2.0

0.4

0.4

0.1-1.9

0.3

Implementation

of intervention

< 36 h after

symptom onset

Intervention Group**

Control Group

Ref.

Ref.

Mask Group

0.23

0.02-3.02

0.26

0.7

0.07-7.9

0.8

Mask & Hygiene Group

0.21

0.02-2.33

0.2

0.2

0.01-3.4

0.3

Intervention Groups combined**

Control Group

Ref.

Ref.

Mask Group +

Mask & Hygiene Group

0.22

0.03-1.6

0.1

0.4

0.05-3.3

0.4

Only A/H1N1 pdm09 Infection

Intervention Group*

Control Group

Ref.

Ref.

Mask Group

0.28

0.08-0.97

0.04

0.46

0.1-1.7

0.2

Mask & Hygiene Group

0.26

0.07-0.93

0.04

0.26

0.06-1.17

0.08

Intervention Groups combined*

Control Group

Ref.

Ref.

Mask Group +

Mask & Hygiene Group

0.27

0.1-0.76

0.01

0.36

0.1-1.1

0.08


Per-protocol analysis. (n = 216 household contacts)

OR Odds ratio, 95% CI 95% Confidence Interval. * adjusted for age, sex, timely therapy of the index, vaccination of household contacts, time spent at home. ** adjusted for age, sex, timely therapy of the index, time spent at home

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

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