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. 2017 Mar 27;18:67. doi: 10.1186/s12891-017-1424-5

Table 1.

Age, sex and type of school for the children participating by study year

Study year 1 (2011–2012) (N = 1015) Study year 2 (2012–2013) (N = 1179) Study year 3 (2013–2014) (N = 1077)
Number of children % girls Number of children % girls Number of children % girls
Age 8 50 54%
Age 9 197 61% 69 55%
Age 10 213 50% 236 58% 68 57%
Age 11 224 50% 271 51% 233 59%
Age 12 225 52% 270 47% 244 52%
Age 13 103 49% 218 57% 226 45%
Age 14 3 33% 112 47% 199 53%
Age 15 3 33% 106 48%
Age 16 1 0%
I-school/c-schoola 602/413 56%/47% 800/518 56%/47% 767/440 55%/48%

aI-school: intervention school, 6 h PE per week

C-school: control school, 2 h PE per week