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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)