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Table 3 Separate models for predictors of qRT-PCR confirmed influenza infection and clinical influenza among included households.

From: The role of facemasks and hand hygiene in the prevention of influenza transmission in households: results from a cluster randomised trial; Berlin, Germany, 2009-2011

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
  1. 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
  2. OR Odds ratio, 95% CI 95% Confidence Interval
  3. *Models also included intervention group as independent variable