Table 1.

Characteristics of the sample and results of the multilevel multivariable linear regression model for Vigorous Physical Activity (minutes per day)

		N	Mean Vigorous Physical Activity (minutes per day)	Crude difference	Adjusted differencea	95% Confidence Interval for the adjusted difference
Sex	Female	5476	52.9	Ref.	Ref.
	Male	5001	68.7	15.8	14.6	(13.2, 16.0)
	Not available	33
Age (years)	14-15	6833	62.6	Ref.	Ref.
	16-17	3677	56.3	-6.3	-1.6	(-3.2, -0.0)
	Not available	0
Parental education	Low	1269	53.5	Ref.	Ref.
	Middle	3706	57.8	4.3	2.0	(-0.4, 4.3)
	High	4226	64.8	11.3	2.7	(0.3, 5.1)
	Not available	1309
Family Affluence Scale	I tertile	3350	55.6	Ref.	Ref.
	II tertile	3060	60.2	4.6	1.2	(-0.6, 3.0)
	III tertile	4100	64.5	8.9	4.7	(2.8, 6.6)
	Not available	0
MacArthur Scale	I tertile	3085	54.3	Ref.	Ref.
	II tertile	3925	59.7	5.4	1.3	(-0.4, 3.1)
	III tertile	3215	67.3	13.0	4.4	(2.5, 6.3)
	Not available	308
Parental employment	One or both employed	9875	61.0	Ref.	Ref.
	Both not in employment	635	50.9	-10.1	-2.5	(-5.6, 0.6)
	Not available	0
Housing tenure	No	1875	54.7	Ref.	Ref.
	Yes	8480	61.7	7.0	2.8	(0.9, 4.7)
	Not available	155
Weekly personal income	0-5 euro	2409	53.6	Ref.	Ref.
	6-20 euro	4907	59.9	6.3	2.0	(0.2, 3.7)
	>20 euro	2996	67.3	13.7	4.7	(2.7, 6.8)
	Not available	198
Academic achievement	Low	1935	57.4	Ref.	Ref.
	Middle	4430	61.2	3.8	2.3	(0.3, 4.3)
	High	4298	61.2	3.8	4.5	(2.5, 6.6)
	Not available	281
Cityb	Namur (BE)	2002	50.8	-9.6	-11.5	(-14.6, -8.4)
	Tampere (FI)	1492	66.8	6.4	6.1	(3.0, 9.2)
	Hannover (GE)	1348	61.9	1.5	2.2	(-0.7, 5.1)
	Latina (IT)	2045	50.8	-9.6	-8.6	(-11.7, -5.6)
	Amersfoort (NL)	1870	80.7	20.3	17.7	(14.7, 20.8)
	Coimbra (PT)	1753	54.1	-6.3	-5.9	(-9.3, -2.5)

^aCoefficient of the multilevel multivariable linear regression model (minutes per day)

^bDeviation from means coding was used in the regression model, thus the reference group is the mean of all cities