Teun Remmers

110 | Chapter 7 Table 1: Descriptive statistics of the study population Individual level ( n =587) Age; mean years (sd) (missing n = 10) 10.2 (0.7) Gender; n boys (%) 280 (47.7) Ethnicity n Dutch (%) (missing n = 9) 490 (84.4) Crow-fly distance from home to school; n (%) within 400 meters 187 (31.9) within 800 meters 225 (38.3) within 1600 meters 119 (20.3) outside 1600 meters 56 (9.5) Network distance from home to school; n (%) distance ≤ 499 meters 138 (23.5) distance 500 – 799 meters 137 (23.3) distance 800 – 1199 meters 171 (29.1) distance ≥ 1200 meters 141 (24.0) Light PA by time of the day; mean % of time per day (sd) 27.9 (6.6) end of the school day – 16:00 hours; mean % (sd) ( n= 539) 35.3 (8.8) 16:00 – 18:00 hours; mean % (sd) ( n= 586) 29.2 (8.2) 18:00 – 20:00 hours; mean % (sd) ( n= 585) 27.5 (7.7) 20:00 – 22:00 hours; mean % (sd) ( n= 326) 20.8 (9.5) MVPA by time of the day; mean % of time per day (sd) 7.7 (4.0) end of the school day – 16:00 hours; mean % (sd) ( n= 539) 10.4 (6.2) 16:00 – 18:00 hours; mean % (sd) ( n= 586) 6.8 (4.8) 18:00 – 20:00 hours; mean % (sd) ( n= 585) 9.2 (7.5) 20:00 – 22:00 hours; mean % (sd) ( n= 326) 4.8 (6.2) Light PA by crow-fly distance; mean % of time per day (sd) 27.9 (6.6) within 400 meters ( n= 187) 28.2 (7.0) within 800 meters ( n= 225) 28.0 (6.4) within 1600 meters ( n= 119) 27.9 (6.3) outside 1600 meters ( n= 56) 27.3 (6.5) MVPA by crow-fly distance; mean % of time per day (sd) 7.7 (4.0) within 400 meters ( n= 187) 7.9 (4.1) within 800 meters ( n= 225) 7.9 (4.1) within 1600 meters ( n= 119) 7.4 (4.0) outside 1600 meters ( n= 56) 7.3 (3.8) Playability and after-school Physical Activity by time-period Children who attended schools in areas with higher playability scores, generally showed significantly higher LPA and MVPA in the first two time-periods (i.e. between the end of the school day and 18:00) (Table 2). By contrast, in the subsequent time-periods, the association between playability and ASPA attenuated. Only the relatively small amount of time performed in light intensity between 20:00 and 22:00 unexpectedly showed a statistical significant relationship with playability.