Table 1. Characteristics of study participants across groups of upper respiratory tract infections (URTI).
| Number of URTIa | ||||||||
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 2–8 | Total | |||||
| Variable | (N = 1012) | (N = 638) | (N = 388) | (N = 2038) | ||||
| Age (years) | ||||||||
| 25–34 | 12.0 | (121) | 13.8 | (88) | 15.2 | (59) | 13.2 | (268) |
| 35–44 | 31.4 | (318) | 31.4 | (200) | 36.9 | (143) | 32.4 | (661) |
| 45–54 | 28.1 | (284) | 26.3 | (168) | 23.7 | (92) | 26.7 | (544) |
| 55–64 | 28.5 | (289) | 28.5 | (182) | 24.2 | (94) | 27.7 | (565) |
| Sex | ||||||||
| Women | 52.5 | (531) | 63.0 | (402) | 71.1 | (276) | 59.3 | (1209) |
| Men | 47.5 | (481) | 37.0 | (236) | 28.9 | (112) | 40.7 | (829) |
| Children ≤ 6 years at home | ||||||||
| No | 84.5 | (589) | 82.0 | (478) | 74.5 | (278) | 81.4 | (1345) |
| Yes | 15.5 | (108) | 18.0 | (105) | 25.5 | (95) | 18.6 | (308) |
| Missing | (315) | (55) | (15) | (385) | ||||
| Daily smoker | ||||||||
| No | 88.1 | (614) | 89.7 | (525) | 89.3 | (334) | 88.9 | (1473) |
| Yes | 11.9 | (83) | 10.3 | (60) | 10.7 | (40) | 11.1 | (183) |
| Missing | (315) | (53) | (14) | (382) | ||||
| Mode of transport to work | ||||||||
| Alone/With family member | 89.5 | (752) | 89.5 | (553) | 90.3 | (347) | 89.7 | (1652) |
| Together with others | 9.4 | (79) | 9.5 | (59) | 9.4 | (36) | 9.4 | (174) |
| Other ways | 1.1 | (9) | 1.0 | (6) | 0.3 | (1) | 0.9 | (16) |
| Missing | (172) | (20) | (4) | (196) | ||||
| Level of education | ||||||||
| Post-secondary | 51.7 | (357) | 60.2 | (351) | 67.4 | (252) | 58.2 | (960) |
| Upper secondary | 37.6 | (260) | 32.9 | (192) | 27.0 | (101) | 33.6 | (553) |
| None/Elementary/Junior secondary | 10.7 | (74) | 6.9 | (40) | 5.6 | (21) | 8.2 | (135) |
| Missing | (321) | (55) | (14) | (390) | ||||
| Body mass index (kg/m2) | ||||||||
| < 18.5 | 0.2 | (1) | 0.7 | (4) | 1.1 | (4) | 0.6 | (9) |
| 18.5–25.0 | 43.5 | (290) | 48.3 | (273) | 52.4 | (185) | 47.2 | (748) |
| 25.0–30.0 | 41.0 | (273) | 36.1 | (204) | 33.7 | (119) | 37.6 | (596) |
| ≥ 30.0 | 15.3 | (102) | 14.9 | (84) | 12.8 | (45) | 14.6 | (231) |
| Missing | (346) | (73) | (35) | (454) | ||||
| Number of close contacts | ||||||||
| < 5 | 11.1 | (77) | 8.7 | (51) | 8.3 | (31) | 9.6 | (159) |
| 5–9 | 17.6 | (123) | 21.1 | (123) | 16.4 | (61) | 18.5 | (307) |
| 10–19 | 28.3 | (197) | 27.9 | (163) | 28.4 | (106) | 28.2 | (466) |
| 20–29 | 16.2 | (113) | 18.7 | (109) | 20.1 | (75) | 18.0 | (297) |
| 30–44 | 14.2 | (99) | 12.5 | (73) | 13.1 | (49) | 13.4 | (221) |
| ≥ 45 | 12.6 | (88) | 11.1 | (65) | 13.7 | (51) | 12.3 | (204) |
| Missing | (315) | (54) | (15) | (384) | ||||
| Treatment: Allergy/Asthma/Lung disease | ||||||||
| No | 80.3 | (539) | 75.4 | (421) | 73.2 | (265) | 77.0 | (1225) |
| Yes | 19.7 | (132) | 24.6 | (137) | 26.8 | (97) | 23.0 | (366) |
| Missing | (341) | (80) | (26) | (447) | ||||
| Treatment: Immunodeficiency/Transplantation | ||||||||
| No | 97.9 | (656) | 98.6 | (546) | 98.3 | (351) | 98.2 | (1553) |
| Yes | 2.1 | (14) | 1.4 | (8) | 1.7 | (6) | 1.8 | (28) |
| Missing | (342) | (84) | (31) | (457) | ||||
| Physical activity (MET-h/d) | ||||||||
| < 37.7 | 33.9 | (183) | 33.4 | (161) | 32.6 | (107) | 33.4 | (451) |
| 37.7–43.9 | 31.7 | (171) | 33.0 | (159) | 36.3 | (119) | 33.3 | (449) |
| ≥ 43.9 | 34.4 | (186) | 33.6 | (162) | 31.1 | (102) | 33.3 | (450) |
| Missing | (472) | (156) | (60) | (688) | ||||
| Sleep duration (hours) | ||||||||
| ≤ 5 | 7.8 | (54) | 7.8 | (45) | 4.0 | (15) | 7.0 | (114) |
| 6–7 | 77.2 | (531) | 74.6 | (429) | 79.9 | (297) | 76.9 | (1257) |
| ≥ 8 | 15.0 | (103) | 17.6 | (101) | 16.1 | (60) | 16.1 | (264) |
| Missing | (324) | (63) | (16) | (403) | ||||
| Sleep quality | ||||||||
| Quite good/Good | 76.0 | (525) | 75.2 | (433) | 74.5 | (277) | 75.4 | (1235) |
| Neither bad nor good/Quite bad/Bad | 24.0 | (166) | 24.8 | (143) | 25.5 | (95) | 24.6 | (404) |
| Missing | (321) | (62) | (16) | (399) | ||||
a The presented data is given as % (N)