Comparison of daily minutes spent on total MVPA* and selected sedentary behaviours† between peer leaders and other students‡
| Baseline§ | 3 months§ | p Value¶ | 7 months§ | p Value¶ | ||||
| Mean | SE | Mean | SE | Mean | SE | |||
| Total MVPA, min/day | ||||||||
| Peers | 195.7 | 10.0 | 181.4 | 9.0 | 173.1 | 17.4 | ||
| Peer leaders | 192.1 | 18.3 | 197.9 | 17.5 | 0.42 | 182.5 | 21.9 | 0.50 |
| Sedentary behaviours | ||||||||
| Peers | 256.9 | 24.9 | 241.1 | 11.8 | 234.5 | 15.2 | ||
| Peer leaders | 210.4 | 30.8 | 231.2 | 21.5 | 0.75 | 217.1 | 22.7 | 0.46 |
| Sedentary behaviours, on weekdays | ||||||||
| Peers | 188.7 | 24.9 | 174.8 | 15.2 | 174.6 | 20.4 | ||
| Peer leaders | 145.1 | 30.3 | 167.7 | 22.6 | 0.80 | 157.5 | 25.6 | 0.41 |
| Sedentary behaviours, on weekend | ||||||||
| Peers | 429.7 | 24.9 | 402.8 | 17.2 | 383.1 | 16.8 | ||
| Peer leaders | 373.6 | 39.2 | 388.4 | 35.9 | 0.75 | 364.5 | 32.0 | 0.65 |
| Computer | ||||||||
| Peers | 47.6 | 12.4 | 42.8 | 5.7 | 45.6 | 4.1 | ||
| Peer leaders | 34.7 | 13.9 | 41.6 | 7.9 | 0.97 | 36.0 | 6.6 | 0.20 |
| Computer, on weekdays | ||||||||
| Peers | 26.6 | 9.8 | 23.4 | 4.8 | 25.1 | 3.9 | ||
| Peer leaders | 16.5 | 11.2 | 21.4 | 6.7 | 0.82 | 18.8 | 6.0 | 0.34 |
| Computer, on weekend | ||||||||
| Peers | 100.5 | 19.1 | 91.4 | 7.9 | 96.0 | 6.7 | ||
| Peer leaders | 80.1 | 22.7 | 92.1 | 13.8 | 0.86 | 78.2 | 12.8 | 0.23 |
↵* MVPA denotes moderate-to-vigorous physical activity, that is, activities with an MET ≥3. Total MVPA is the sum of in-school and out-of-school MVPA and active commuting to school.
↵† Information on daily time spent on sedentary behaviours was collected with an 8-item scale by weekdays and weekend, including TV viewing; DVD viewing; computer usage; playing video games; extracurricular reading; extracurricular writing, drawing and listening to music; being a passenger in a bicycle, a subway, a bus or a car; sitting and talking (face-to-face or by phone). Total sedentary behaviours are the sum of the 8 items.
↵‡ Number of peer leaders is 59 and of other students is 286.
↵§ Data were adjusted for age, gender and body mass index at baseline.
↵¶ Comparison between intervention and control groups was adjusted for age, gender, body mass index at baseline, interaction between measurement time and groups, and cluster effect in school and class level, within-subject correlation using PROC GLIMMIX procedure in SAS V.9.2.