Unadjusted change between baseline (age 9/10 years) and 4 years (age 13/14 years) in sedentary time, LPA, MPA, VPA and MVPA over 4 years for participants with data at SPEEDY-1 and SPEEDY-3 (n=409; boys n=189; girls; n=220)
| Baseline (min/day) | Change (min/day) | p Value† | Change (% baseline value) | Percentage of who decreased‡ | Baseline (% worn time) | Change (% worn time) | p Value¶ | |
|---|---|---|---|---|---|---|---|---|
| Sedentary | ||||||||
| All | 460.0±53.8 | 41.1±71.5* | 0.260 | 10.2±17.0 | 16.9 | 64.2±5.9 | 7.2±6.6§ | 0.98 |
| Boys | 451.3±53.3 | 45.2±73.5* | 11.2±17.4 | 62.8±6.2 | 7.2±6.1§ | |||
| Girls | 467.4±53.3 | 37.4±67.8* | 9.3±16.6 | 65.3±5.4 | 7.2±5.8§ | |||
| LPA | ||||||||
| All | 182.4±31.8 | −42.9±35.7* | 0.01 | −22.4±18.4 | 69.6 | 25.4±3.6 | −5.6±4.3§ | 0.01 |
| Boys | 184.1±32.2 | −38.1±36.7* | −19.4±19.1 | 25.6±3.7 | −5.0±4.5§ | |||
| Girls | 181.0±31.6 | −47.1±34.3* | −24.9±17.4 | 25.2±3.6 | −6.1±4.1§ | |||
| MPA | ||||||||
| All | 48.9±13.5 | −5.9±18.1* | <0.001 | −7.0±39.1 | 58.5 | 6.8±1.8 | −0.7±2.5§ | <0.001 |
| Boys | 53.2±13.9 | −10.0±18.1* | −14.2±36.9 | 7.4±1.9 | −1.3±2.6§ | |||
| Girls | 45.3±12.0 | −2.4±17.3** | −0.8±40.0 | 6.3±1.6 | −0.2±2.3 | |||
| VPA | ||||||||
| All | 25.9±14.0 | −6.8±16.2* | 0.96 | −11.0±76.3 | 59.7 | 3.6±1.9 | −0.9±2.3§ | 0.95 |
| Boys | 30.4±15.6 | −6.7±17.2* | −4.9±74.6 | 4.2±2.1 | −0.9±2.4§ | |||
| Girls | 22.1±11.1 | −6.8±15.3* | −16.2±77.5 | 3.1±1.5 | −0.9±2.2§ | |||
| MVPA | ||||||||
| All | 74.9±24.9 | −12.6±29.2* | 0.009 | −10.3±41.5 | 59.6 | 10.4±3.3 | −1.6±4.1§ | 0.007 |
| Boys | 83.5±26.8 | −16.7±31.3* | −13.3±42.2 | 11.6±3.6 | −2.2±4.4§ | |||
| Girls | 67.4±20.5 | −9.2±26.9* | −7.7±40.8 | 9.4±2.7 | −1.1±3.8§ | |||
Change calculated as follow-up−baseline. Values are mean±SD unless otherwise specified.
*p<0.001
**p=0.045 for overall change in min.
†p Value for change in boys versus girls in min. Percentage baseline value calculated as (follow-up min/day minus baseline min/day)/baseline min/day)×100 Percentage worn time calculated as ((follow-up mins/follow-up worn time)×100) − ((baseline mins/baseline worn time)×100)
‡The percentage of participants who experienced a decrease between their first and last measurements.
§p<0.001 for overall change in percentage of monitor worn time.
¶p Value for change in boys versus girls in percentage of monitor worn time.
LPA, light physical activity; MPA, moderate physical activity; MVPA, moderate and vigorous physical activity; SPEEDY, Sport, Physical activity and Eating behaviour: Environmental Determinants in Young people; VPA, vigorous physical activity.