Table 2.
Socio-demographic characteristics, exposure and health characteristics of participants of the study according to the season
| Variables | Season 2014–2015 n (%) |
Season 2015–2016 n (%) |
Season 2016–2017 n (%) |
|---|---|---|---|
| Socio-demographic characteristics | |||
| Gender (m.d. = 0) | |||
| Female | 2326 (60%) | 2942 (60%) | 3113 (60%) |
| Male | 1579 (40%) | 1964 (40%) | 2051 (40%) |
| Age (m.d. = 18) | |||
| [0–10[ | 98 (3%) | 188 (4%) | 175 (3%) |
| [10–15[ | 104 (3%) | 128 (3%) | 115 (2%) |
| [15–60[ | 1970 (50%) | 2541 (52%) | 2660 (52%) |
| > 60 | 1732 (44%) | 2042 (42%) | 2205 (43%) |
| Household composition (m.d. =49) | |||
| Living alone | 614 (16%) | 765 (16%) | 838 (16%) |
| Living with ≥1 child | 1219 (31%) | 1590 (33%) | 1634 (32%) |
| Living with adults only | 2059 (53%) | 2532 (52%) | 2675 (52%) |
| Main activity (m.d. = 258) | |||
| Working | 1822 (48%) | 2320 (48%) | 2453 (48%) |
| Student | 344 (9%) | 487 (10%) | 456 (9%) |
| Unemployed | 109 (3%) | 133 (3%) | 128 (3%) |
| Retired | 1411 (37%) | 1702 (35%) | 1846 (36%) |
| Stay at home/Sick leave | 148 (4%) | 171 (4%) | 187 (4%) |
| Level of education (m.d. = 90) | |||
| Middle school diploma | 613 (16%) | 707 (15%) | 814 (16%) |
| High school diploma | 696 (18%) | 861 (18%) | 944 (18%) |
| Higher education | 2223 (57%) | 2807 (58%) | 3043 (59%) |
| Not concerneda | 336 (9%) | 498 (10%) | 343 (7%) |
| Place of residency (m.d. = 0) | |||
| Urbain | 3145 (81%) | 3973 (81%) | 4161 (81%) |
| Rural | 760 (19%) | 933 (19%) | 1003 (19%) |
| Exposure | |||
| Use of public transportation (m.d. = 0) | |||
| Yes | 605 (15%) | 770 (16%) | 813 (16%) |
| No | 3300 (85%) | 4136 (84%) | 4351 (84%) |
| Contacts (m.d. = 0) | |||
| Contact with patients | 388 (10%) | 476 (10%) | 555 (11%) |
| Contact with elderly | 401 (10%) | 486 (10%) | 537 (10%) |
| Contact with a group of people (≥10) | 1230 (31%) | 1533 (31%) | 1677 (32%) |
| Contact with children | 952 (24%) | 1213 (25%) | 1223 (24%) |
| Pets at home (m.d. = 22) | |||
| None | 2127 (55%) | 2711 (55%) | 2851 (55%) |
| At least one | 1774 (45%) | 2187 (45%) | 2303 (45%) |
| Health characteristics | |||
| Common colds frequency (m.d. = 358) | |||
| Never | 1749 (45%) | 2079 (44%) | 2248 (44%) |
| Rare | 1401 (36%) | 1740 (37%) | 1890 (37%) |
| Often | 698 (18%) | 898 (19%) | 914 (18%) |
| Smoking status (m.d. = 16) | |||
| Non smoker | 3492 (90%) | 4377 (89%) | 4597 (89%) |
| Smoker | 406 (10%) | 525 (11%) | 562 (11%) |
| Comorbidities (m.d. = 0) | |||
| No comorbidities | 3094 (79%) | 3827 (78%) | 4066 (79%) |
| At least one comorbidityb | 811 (21%) | 1079 (22%) | 1098 (21%) |
| Treated asthma | 219 (6%) | 319 (7%) | 303 (6%) |
| Treated diabetes | 139 (4%) | 184 (4%) | 203 (4%) |
| Treated heart condition | 397 (10%) | 501 (10%) | 502 (10%) |
| Treated kidney condition | 22 (1%) | 36 (1%) | 29 (1%) |
| Treated immunosuppression | 109 (3%) | 144 (3%) | 133 (3%) |
| Treated pulmonary condition | 102 (3%) | 139 (3%) | 124 (2%) |
| Respiratory allergy (m.d. = 0) | |||
| None | 2609 (67%) | 3267 (67%) | 3378 (65%) |
| At least one | 1296 (33%) | 1639 (33%) | 1786 (35%) |
| Pregnancy (m.d. = 67) | |||
| Yes | 39 (1%) | 56 (1%) | 50 (1%) |
| No | 660 (17%) | 871 (18%) | 962 (19%) |
| Not concernedc | 3191 (82%) | 3943 (81%) | 4136 (80%) |
| BMI (m.d. = 229) | |||
| Underweight (< 18.5) | 185 (5%) | 207 (4%) | 231 (5%) |
| Normal weight ([18.5–25[) | 2208 (57%) | 2791(58%) | 2911 (57%) |
| Overweight ([25–30[) | 1027 (27%) | 1292 (27%) | 1368 (27%) |
| Obese (> 30) | 424 (11%) | 526 (11%) | 576 (11%) |
m.d. missing data. The number correspond to the total of missing data for both seasons
aChildren and students not having finished their studies
bParticipants having responded they are taking medication for at least one of the condition listed below
cWomen under 15 or above 55 and men