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Table 1 Individuals by typical hand-washing frequency and sociodemographic characteristics among participants (n = 2963) providing valid exposure information

From: Associations of hand-washing frequency with incidence of acute respiratory tract infection and influenza-like illness in adults: a population-based study in Sweden

Variable Grouping Typical hand-washing frequency (times per day)  
0-1 2-4 5-9 10-19 ≥20 Missing info Total
Number of individuals (row percentages)
Gender Male 16 (1%) 230 (21%) 516 (47%) 186 (17%) 121 (11%) 29 (3%) 1098 (100%)
Female 5 (0.3%) 121 (6%) 665 (36%) 582 (31%) 443 (24%) 49 (3%) 1865 (100%)
Age (years) 17-26 2 (2%) 23 (19%) 59 (49%) 18 (15%) 17 (14%) 2 (2%) 121 (100%)
27-46 5 (1%) 79 (11%) 269 (37%) 214 (29%) 135 (19%) 25 (3%) 727 (100%)
47-66 8 (1%) 125 (10%) 467 (38%) 339 (27%) 269 (22%) 27 (2%) 1235 (100%)
≥67 6 (1%) 124 (14%) 386 (44%) 197 (22%) 143 (16%) 24 (3%) 880 (100%)
Occupational status1 A1 8 (1%) 158 (11%) 565 (38%) 400 (27%) 329 (22%) 29 (2%) 1489 (100%)
B1 8 (1%) 152 (13%) 496 (44%) 271 (24%) 172 (15%) 30 (3%) 1129 (100%)
C1 5 (2%) 37 (13%) 108 (37%) 84 (29%) 53 (18%) 5 (2%) 292 (100%)
Missing info 0 (0%) 4 (8%) 12 (23%) 13 (25%) 10 (19%) 14 (26%) 53 (100%)
Education (years) < 9 2 (1%) 35 (11%) 131 (41%) 91 (28%) 54 (17%) 10 (3%) 323 (100%)
9-13 10 (1%) 116 (12%) 379 (40%) 230 (24%) 203 (21%) 21 (2%) 959 (100%)
>13 9 (1%) 189 (12%) 621 (40%) 418 (27%) 282 (18%) 27 (2%) 1546 (100%)
Missing info 0 (0%) 11 (8%) 50 (37%) 29 (21%) 25 (19%) 20 (15%) 135 (100%)
Vaccination No 10 (1%) 106 (12%) 354 (40%) 212 (24%) 183 (21%) 22 (2%) 887 (100%)
Yes2 11 (1%) 242 (12%) 820 (40%) 552 (27%) 380 (19%) 43 (2%) 2048 (100%)
Missing info 0 (0%) 3 (11%) 7 (25%) 4 (14%) 1 (4%) 13 (46%) 28 (100%)
Household size (persons) 1 9 (1%) 112 (14%) 331 (42%) 178 (23%) 136 (17%) 22 (3%) 788 (100%)
2 7 (1%) 153 (11%) 528 (39%) 356 (26%) 278 (21%) 26 (2%) 1348 (100%)
≥3 5 (1%) 86 (11%) 318 (39%) 231 (29%) 146 (18%) 23 (3%) 809 (100%)
Missing info 0 (0%) 0 (0%) 4 (22%) 3 (17%) 4 (22%) 7 (39%) 18 (100%)
Overall close contacts 0-4 4 (1%) 97 (19%) 230 (46%) 105 (21%) 54 (11%) 8 (2%) 498 (100%)
5-19 8 (1%) 160 (13%) 516 (43%) 300 (25%) 185 (16%) 21 (2%) 1190 (100%)
≥20 9 (1%) 86 (8%) 394 (35%) 332 (29%) 300 (27%) 8 (1%) 1129 (100%)
Missing info 0 (0%) 8 (5%) 41 (28%) 31 (21%) 25 (17%) 41 (28%) 146 (100%)
Close contacts with children <13 years 0 6 (1%) 161 (14%) 519 (44%) 258 (22%) 205 (18%) 22 (2%) 1171 (100%)
1-4 10 (1%) 136 (12%) 451 (41%) 296 (27%) 187 (17%) 10 (1%) 1090 (100%)
≥5 4 (1%) 37 (7%) 152 (31%) 164 (33%) 135 (27%) 6 (1%) 498 (100%)
Missing info 1 (0.5%) 17 (8%) 59 (29%) 50 (25%) 37 (18%) 40 (20%) 204 (100%)
Healthcare work No 9 (1%) 181 (12%) 623 (41%) 424 (28%) 259 (17%) 28 (2%) 1524 (100%)
Yes 2 (1%) 7 (3%) 33 (16%) 45 (22%) 116 (57%) 2 (1%) 205 (100%)
Missing info 10 (1%) 163 (13%) 525 (43%) 299 (24%) 189 (15%) 48 (4%) 1234 (100%)
TOTAL   21 (1%) 351 (12%) 1181 (40%) 768 (26%) 564 (19%) 78 (3%) 2963 (100%)
  1. 1A = Gainfully employed; B = Retired/long term sick leave; C = Student/Other.
  2. 2For seasonal or pandemic flu after September 2009.