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Table 2 Sample characteristics for SPEEDY participants included in these analyses (n = 325)

From: School polices, programmes and facilities, and objectively measured sedentary time, LPA and MVPA: associations in secondary school and over the transition from primary to secondary school

  SPEEDY 1 (2007) SPEEDY 3 (2011)
Sex (%)   
   Male 47.7 -
   Female 52.3 -
Age (years, mean(SD)) 10.24 (.32) 14.32 (.30)
Ethnicity (%)   
   White 97 -
   Other 3 -
BMI (mean(SD)) 18.05 (3.15) 20.95 (4.01)
Family SES (%)   
   Low 18.3 -
   Middle 39.1 -
   High 42.6 -
Physical activity School day Lunchtime School day Lunchtime
(n = 321) (n = 321) (n = 315) (n = 325)
No. of valid days per participant (mean(SD)) 4.3 (0.8) 4.7 (0.7) 4.2 (0.9) 4.3 (0.9)
Proportion of wear-time (%)
   SED 71 53 77 64
   Light PA 21 29 16 23
   MVPA 8 18 7 13
Time spent (minutes, mean(SD))     
   SED 272.90 (25.54) 31.27 (7.00) 300.16 (29.87) 31.07 (9.59)
   LPA 80.65 (16.31) 17.00 (3.50) 64.65 (18.87) 11.33 (4.60)
   MVPA 30.76 (10.76) 10.55 (4.92) 27.43 (13.70) 6.49 (4.66)
  1. SD, standard deviation; SED, sedentary behaviour; MVPA, moderate to vigorous intensity physical activity. Valid days were defined as days in which wear time ≥80 % of the duration of lunchtime and/or school day