Table 1.

Sample characteristics (n = 139).

Characteristic	N	%/mean (± SD)
Gender (% boys)	139	49.6
Age (years)	139	9.7 (0.656)
Grade	139
Grade three	61	43.9
Grade four	78	56.1
Ethnicity	137
Dutch	130	94.9
Western	4	2.9
Non-Western	3	2.2
SES (%) 1	139
Lowest tertile	23	16.5
Middle tertile	45	32.4
Highest tertile	71	51.1
HL	139	3.1 (0.447)
BMI z-score	139	−0.2 (0.891)
PA score	139	3.0 (0.684)
Fruit consumption	139
Never	1	0.7
Almost never	2	1.4
Sometimes (1–3 times/week)	13	9.4
Often (4–6 times/week)	43	30.9
Every day	80	57.6
Vegetable consumption	139
Never	1	0.7
Almost never	2	1.4
Sometimes (1–3 times/week)	23	16.5
Often (4–6 times/week)	70	50.4
Every day	43	30.9
Water consumption	139
Never	0	0.0
Almost never	11	7.9
Sometimes (1–3 times/week)	34	24.5
Often (4–6 times/week)	45	32.4
Every day	49	35.3
Soft drink consumption	139
Never	6	4.3
Almost never	37	26.6
Sometimes (1–3 times/week)	62	44.6
Often (4–6 times/week)	17	12.2
Every day	17	12.2

Abbreviations: SD, standard deviation; SES, socio-economic status; HL, health literacy; BMI, body mass index; PA, physical activity. ¹ Due to clustering of SES scores around several scores, the tertile group sizes are unequal.