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. 2020 Nov 30;75(6):489–495. doi: 10.1136/jech-2020-215678

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.