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