Table 1.

Age and body mass index (BMI) distribution of the individuals: In the total group and divided by gender.

	Total Group			Girls			Boys			p-Value
Age (years)	N	%	BMI mean ± SD	N	%	BMI mean ± SD	N	%	BMI mean ± SD
13	1270	9.0	20.1 ± 3.66	670	8.9	19.9 ± 3.55	600	9.2	20.3 ± 3.78	0.0854
14	1876	13.4	20.5 ± 3.48	1004	13.3	20.3 ± 3.41	872	13.4	20.6 ± 3.54	0.0414 1
15	2011	14.3	20.8 ± 3.37	1040	13.8	20.6 ± 3.17	971	15.0	21.0 ± 3.56	0.0485 1
16	2386	17.0	21.3 ± 3.31	1257	16.6	21.1 ± 3.08	1129	17.4	21.6 ± 3.54	0.0024 1
17	2781	19.8	21.8 ± 3.48	1538	20.4	21.3 ± 3.30	1243	19.2	22.3 ± 3.61	0.0000 1
18	2551	18.2	21.9 ± 3.41	1436	19.0	21.3 ± 3.16	1115	17.2	22.7 ± 3.56	0.0000 1
19	1169	8.3	22.2 ± 3.61	608	8.1	21.7 ± 3.68	561	8.6	22.6 ± 3.48	0.0000 1
All age groups	14044	100.0	21.3 ± 3.51	7553	53.8	20.9 ± 3.33	6491	46.2	21.7 ± 3.68	0.0000 1

¹ Significant differences in average BMI between girls and boys for age categories and for the total (all age groups), the Mann–Whitney test.