. 2015 Aug;105(8):e90–e97. doi: 10.2105/AJPH.2015.302717

TABLE 1—

Comparisons of Sociodemographic and Health-Related Indicators: General Dutch Population and the Study Samples, 2014

		Panel A^b		ASeedRec Sample		Panel B		BSeedRec Sample
Indicator	Dutch Population,^a % or Mean (SD)	% or Mean (SD)	P	% or Mean (SD)	P	% or Mean (SD)	P	% or Mean (SD)	P
Female	50.5	57.4	< .001	66.5	< .001	64.8	< .001	57.6	.023
Age, y	40.2 (23.0)	52.0 (16.2)	. . .	53.0 (14.8)	. . .	55.0 (13.7)	. . .	56.8 (12.6)	. . .
Educational level, bachelor’s degree or higher	18.9^c	56.1	< .001	58.9	< .001	43.2	< .001	50.6	< .001
Single-member household	16.7^d	19.5	< .001	26.2^e	< .001	17.8	.238	20.7^e	.095
Household with only adults	25.7^d	42.8	< .001	48.3	< .001	51.3	< .001	59.4	< .001
Household with children	24.3^d	27.9	< .001	25.6	.344	30.9	< .001	19.9	.104
Daily contact with patients	12.2	9.6	< .001	11.2	.345	. . .	. . .	11.4	.788
Vaccinated against seasonal influenza in past 12 mo	23.8	36.1	< .001	37.9	< .001	48.4	< .001	56.4	< .001
Asthma or chronic obstructive pulmonary disease	7.4	12.4^f	< .001	3.6^g	< .001	34.4	< .001	20.7^g	< .001
Allergy	8.5	55.9	< .001	6.6^g	.024	32.9^h	< .001	7.7^g	.738

^{^a}

Based on data provided by Statistics Netherlands.¹⁴

^{^b}

Based on information from Influenzanet.¹²

^{^c}

With respect to educational level, Statistics Netherlands¹⁴ provides data on the population aged 15–64 years.

^{^d}

StatLine provides information only on the number of children in the household, regardless of age.

^{^e}

Forty ASeedRec participants and 6 BSeedRec participants did not provide information on household members and were assumed to live alone.

^{^f}

Also includes panel A volunteers with lung disease.

^{^g}

We asked participants about these risk conditions only if they reported symptoms.

^{^h}

Panel B volunteers were asked about hay fever and allergy.