Table 1.
Sociodemographic characteristics of participants in the PICO-study and weighted seroprevalence in the general population of the Netherlands, first round of inclusion, by national sample and low vaccination coverage sample
| National sample | Low vaccination coverage sample | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Total | Weighted SARS-CoV-2 seroprevalence | Total | Weighted SARS-CoV-2 seroprevalence | |||||||
| n | % | % | 95% CI | n | % | % | 95% CI | |||
| Overall | 2637 | 100 | 2.8 | 2.1–3.7 | 570 | 100 | 2.9 | 1.4–6.3 | ||
| Sex | ||||||||||
| Men | 1184 | 44.9 | 2.9 | 1.8–4.5 | 233 | 40.9 | 4.0 | 1.5–10.6 | ||
| Women | 1453 | 55.1 | 2.7 | 1.7–4.1 | 337 | 59.1 | 1.9 | 0.7–4.9 | ||
| Age categories | ||||||||||
| 2–17 | 507 | 19.2 | 1.7 | 0.6–4.9 | 93 | 16.3 | 0.0 | NA | ||
| 18–39 | 735 | 27.9 | 4.9 | 3.2–7.5 | 196 | 34.4 | 6.8 | 3.0–14.6 | ||
| 40–64 | 919 | 34.8 | 1.9 | 1.2–3.2 | 198 | 34.7 | 2.4 | 0.7–8.3 | ||
| 65–90 | 476 | 18.1 | 2.5 | 1.2–5.1 | 83 | 14.6 | 1.0 | 0.1–7.0 | ||
| Region | ||||||||||
| North | 566 | 21.5 | 1.3 | 0.4–3.2 | NA | NA | NA | NA | ||
| Mid-West | 427 | 16.2 | 4.0 | 1.8–8.0 | NA | NA | NA | NA | ||
| Mid-East | 508 | 19.3 | 3.1 | 1.3–6.2 | NA | NA | NA | NA | ||
| South-West | 468 | 17.7 | 3.0 | 1.5–5.3 | NA | NA | NA | NA | ||
| South-East | 668 | 25.3 | 2.7 | 1.4–4.7 | NA | NA | NA | NA | ||
| Low vaccination coverage municipalities | NA | NA | NA | NA | 570 | 100 | 2.9 | 1.4–6.3 | ||
| Ethnicity | ||||||||||
| Dutch | 2306 | 87.5 | 2.8 | 2.0–3.7 | 555 | 97.4 | 3.0 | 1.4–6.5 | ||
| Non-Dutch Western | 159 | 6.0 | 2.0 | 0.6–7.1 | 12 | 2.1 | 0.0 | NA | ||
| Non-Western | 172 | 6.5 | 3.4 | 1.4–8.4 | 3 | 0.5 | 0.0 | NA | ||
| Educational level* | ||||||||||
| High | 1257 | 46.7 | 2.5 | 1.6–3.9 | 173 | 30.7 | 2.3 | 0.5–9.4 | ||
| Middle | 883 | 34.2 | 3.5 | 2.0–6.2 | 252 | 44.8 | 4.4 | 1.7–10.9 | ||
| Low | 442 | 17.1 | 2.2 | 1.0–5.0 | 138 | 24.5 | 0.9 | 0.1–6.3 | ||
| Religion | ||||||||||
| No religion | 1329 | 54.5 | 2.9 | 1.9–4.4 | 145 | 28.0 | 0.3 | 0.0–3.7 | ||
| Roman Catholic | 613 | 25.1 | 3.4 | 1.7–6.6 | 13 | 2.5 | 0.0 | NA | ||
| Other | 119 | 4.9 | 0.0 | NA | 14 | 2.7 | 0.0 | NA | ||
| Protestant | 379 | 15.5 | 3.0 | 1.6–6.4 | 346 | 66.8 | 3.7 | 1.5–8.8 | ||
| Orthodox-Reformed | 28 | 7.4 | 8.5 | 2.4–26.9 | 102 | 29.5 | 7.4 | 1.8–26.8 | ||
| Other | 351 | 92.6 | 2.6 | 1.0–6.5 | 244 | 70.5 | 2.2 | 0.9–5.3 | ||
NA, Not applicable.
*Maternal educational level was used for participants <15 years of age.
Missing: in the national sample: (maternal) educational level=55, religion=197; in the low vaccination coverage sample: (maternal) educational level=7, religion: 52.