Table 1.

Characteristics of the respondents

	All participants (N = 1361)
Demographic factors	n/N	%
Age
18–24 years  25–30 years  31–35 years  36–40 years  40 + years	50/1361 532/1361 576/1361 178/1361 25/1361	3.7 39.1 42.3 13.1 1.8
Education
Low  Intermediate  High	57/1361 395/1361 909/1361	4.2 29.0 66.8
Country of birth
Dutch  Other	1286/1361 75/1361	94.5 5.5
Personal factors
Pertussis vaccination
Yes  No	1294/1361 67/1361	95.1 4.9