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Table 6 Adherence to interventions in index patients and household contacts by intervention group and study season

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

Variables Index Contacts
  Mask Group Mask & Hygiene Group Mask Group Mask & Hygiene Group
  2009/ 2010 2010/ 2011 2009/ 2010 2010/ 2011 2009/ 2010 2010/ 2011 2009/ 2010 2010/ 2011
Hygiene variables         
Number of hand disinfections per day - mean ± SD NA 7.4 (6.3-8.5)* 4.1 (3.3-4.8)* NA 8.8 (7.9-9.6) 7.5 (6.5-8.5)
Adherent to intensified hand hygiene during each of the five days after implementation of the intervention (adherence def. 2) - n/n (%)** NA 8/17 (47)* 1/9 (9)* NA 15/39 (38) 13/28 (46)
Hand disinfection/-washing after coming home*** - n/n (%) 7/9 (78) 7/14 (50) 10/16 (63) 6/11 (55) 11/23# (64) 21/30# (70) 28/32# (88) 20/22# (91)
Hand disinfection/-washing after touching contaminated objects*** - n/n (%) 1/11 (9) 0 3/17 (18) 1/11 (9) 11/23# (48) 16/30# (53) 28/32# (88) 16/22# (73)
Hand disinfection/-washing before eating*** - n/n (%) 8/11 (73) 6/15 (40) 13/17 (77) 6/11 (55) 23/23# (100) 27/30# (90) 28/32# (88) 15/22# (68)
Hand disinfection/-washing after coughing/sneezing*** - n/n (%) 5/11 (46) 0 9/17 (53) 3/11 (27) 17/30# (57) 16/38# (42) 22/38# (58) 8/28# (29)
Mask variables         
Adherent to facemask use during each of the five days after full implementation of the intervention (adherence definition 2) - n/n (%)## 6/11 (55) 7/15 (47) 7/17 (41) 2/11 (18) 17/31 (55) 18/39 (46) 17/38 (45) 13/28 (46)
Wore facemask when being in the same room with index/contact*** - n/n (%) 8/10 (80) 8/15 (53) 13/16 (81) 6/11 (55) 23/31 (74) 32/37 (87) 26/38 (68) 24/28 (86)
Wore facemask when being in close contact to index/contact*** - n/n (%) 7/10 (70) 9/15 (60) 13/16 (81) 5/11 (46) 24/31 (77) 34/38 (90) 27/38 (71) 21/28 (75)
Wore facemask when providing care to index/being provided for by household contact*** - n/n(%) 6/9 (67) 4/5 (80) 6/12 (50) 3/7 (43) 10/16 (63) 13/16 (81) 12/21 (57) 12/13 (92)
  1. NA not applicable, HD hand disinfection, SD standard deviation. * p < 0.05 between seasons. ** Adherence to hand hygiene measure was defined as disinfection of hands at least 5 times per day during the 5 day after full implementation of the intervention (based on data from daily questionnaire). *** based on data from exit questionnaire. #only adults. ## Adherence to facemask intervention was defined as wearing a facemask "mostly" or "always" on each of the 5 days after full implementation of the intervention (based on data from daily questionnaire)