Table 2.
Adjusted associations between academic achievement and physical activity/sedentary variables from multiple multilevel linear regression models
| Total pointsa | |||
|---|---|---|---|
| Β (95 % CI) | P value | ||
| In separate models | |||
| Sedentary time | (hr/day) | 6·9 (1·5, 12·4) | 0·016 |
| MVPA | (min/day) | −1·8 (−7·5, 3·8) | 0·497 |
| Screen time | (hr/day) | −9·3 (−14·3, −4·3) | 0·001 |
| Non-screen sedentary | (hr/day) | 23·1 (14·6, 31·6) | <0·001 |
| Mutually adjusted | |||
| Sedentary time | (hr/day) | 6·2 (0·6, 11·9) | 0·033 |
| MVPA | (min/day) | 1·0 (−5·7, 5·8) | 0·996 |
| Screen time | (hr/day) | −9·1 (−14·5, −3·7) | 0·003 |
| Non-screen sedentary | (hr/day) | 24·7 (17·3, 32·0) | <0·001 |
| Quadratic functions | |||
| Non-screen sedentary quadratic | (hr/day)^2 | −8·3 (−12·3, −4·3) | <0·001 |
| Non-screen sedentary | (hr/day) | 67·6 (44·8, 90·3) | <0·001 |
All models clustered for school and adjusted for MFQ, BMI z-score, deprivation, season of physical activity measurement, and sex
aCalculated to include GCSE and GNVQ results e.g., for GCSEs A* = 58, A = 52…G = 16, and similar for GNVQ grades
Sedentary hr/day spent <1.5 METS
MVPA mean mins/day spent in moderate and vigorous physical activity above 4 METS
Screen time sedentary includes self-reported time spent in TV/DVD, Internet and Computer games
Non Screen time sedentary includes self-reported time spent in homework and reading
Quadratic functions are only shown if significant