Table 1.
Baseline characteristics of the eligible study participants (the Netherlands, 17 March through 24 May 2020; n = 25 663)
| Characteristic | N | Percentage |
|---|---|---|
| Reported 0 COVID-19-like illness episodes | 20 467 | 79.8 |
| Reported 1 COVID-19-like illness episode | 3909 | 15.2 |
| Reported ⩾2 COVID-19-like illness episode | 1287 | 5.0 |
| Sex | ||
| Male | 9905 | 38.6 |
| Female | 15 758 | 61.4 |
| Age group (years) | ||
| 15–24 | 1112 | 4.3 |
| 25–34 | 5159 | 20.1 |
| 35–44 | 6202 | 24.2 |
| 45–54 | 5786 | 22.6 |
| 55–64 | 4468 | 17.4 |
| 65+ | 2936 | 11.4 |
| Regiona | ||
| West | 11 917 | 46.4 |
| South | 6388 | 24.9 |
| East | 5052 | 19.7 |
| North | 2306 | 9.0 |
| (missing) | 449 | |
| Education level | ||
| None/primary | 961 | 3.8 |
| Middle | 9997 | 39.0 |
| Higher | 14 705 | 57.3 |
| Ever smoker | 4137 | 16.1 |
| Asthma | 1979 | 7.7 |
| Allergy(s)/hay fever | 9618 | 37.5 |
| Diabetes | 681 | 2.7 |
| Chronic lung disease | 567 | 2.2 |
| Cardiovascular disease | 1419 | 5.5 |
| 1+ children <5 years in household | 3818 | 14.9 |
| 1+ children 5–18 years in household | 21 891 | 85.3 |
a
Region West consists of the provinces North Holland, South Holland, Utrecht, Zeeland; South: North Brabant, Limburg; East: Flevoland, Gelderland, Overijssel; North: Drenthe, Friesland, Groningen.