Descriptive statistics of the study population stratified by disease severity
| Characteristic | All (n=452) MED (IQR) or n (%) | Disease severity | ||
| Asymptomatic (n=59) MED (IQR) or n (%) | Mild illness (n=287) MED (IQR) or n (%) | Moderate illness (n=106) MED (IQR) or n (%) | ||
| Age (years)* | 42 (31–51) | 43 (31–56) | 41 (31–51) | 42 (32–49) |
| Sex | ||||
| Female | 216 (47.8) | 19 (32.2) | 134 (46.7) | 63 (59.4) |
| Male | 236 (52.2) | 40 (67.8) | 153 (53.3) | 43 (40.6) |
| BMI (kg/m2)* | 24.9 (22.1, 27.8) | 25.5 (22.2, 28.2) | 24.7 (22.1, 27.5) | 25.5 (22.2, 29.2) |
| Comorbidities | ||||
| No comorbidities | 359 (79.4) | 42 (71.2) | 243 (84.7) | 74 (69.8) |
| At least one comorbidity | 93 (20.6) | 17 (28.8) | 44 (15.3) | 32 (30.2) |
| Smoking status* | ||||
| Never smoker | 291 (64.4) | 34 (57.6) | 184 (64.1) | 73 (68.9) |
| Former smoker | 84 (18.6) | 13 (22.0) | 55 (19.2) | 16 (15.1) |
| Current smoker | 77 (17.0) | 12 (20.3) | 48 (16.7) | 17 (16.0) |
| Income (euro/month)* | ||||
| <€3000 | 71 (15.7) | 11 (18.6) | 39 (13.6) | 21 (19.8) |
| €3000–€4999 | 110 (24.3) | 15 (25.4) | 70 (24.4) | 25 (23.6) |
| €5000–€10 000 | 203 (44.9) | 23 (39.0) | 138 (48.1) | 42 (39.6) |
| >€10 000 | 68 (15.0) | 11 (18.6) | 40 (13.9) | 18 (17.0) |
| Sedentary behaviour (hour/day)* | 7 (4, 10) | 6 (4, 10) | 7 (4, 10) | 6 (4, 9) |
| Physical activity (MET-hour/week) | 52.9 (30.8, 82.3) | 63.0 (40.3, 98.5) | 52.0 (31.4, 81.0) | 49.3 (27.4, 73.9) |
| Physical activity (MET-hour/week) | ||||
| <30 | 108 (23.9) | 10 (16.9) | 68 (23.7) | 30 (28.3) |
| 30–52 | 113 (25.0) | 13 (22.0) | 75 (26.1) | 25 (23.6) |
| 52–82 | 116 (25.7) | 16 (27.1) | 74 (25.8) | 26 (24.5) |
| >82 | 115 (25.4) | 20 (33.9) | 70 (24.4) | 25 (23.6) |
*Imputed data were used for the descriptive statistics.
BMI, body mass index; MED, median; MET, metabolic equivalent task.