Table 4. Simple associations of behavioural, environmental, social and psychological factors with changes in after-school and weekend sedentary time.

Variable	After-schoola		Weekend
	β	95% CI	β	95% CI
Behavioural
School travel mode
Car (ref)
Bus/Train	0.82	(-2.1, 3.7)	1.5	(-2.0, 5.0)
Cycle	-3.4	(-6.6, -0.20)**	-1.4	(-5.2, 2.5)
Walk	-0.53	(-2.2, 1.1)	0.81	(-1.3, 2.9)
After school destination
Home (ref)
Friends house	1.3	(-1.8, 4.4)	0.28	(-3.4, 3.9)
Park/Shops/Other	0.52	(-1.5, 2.5)	-0.57	(-3.0, 1.8)
Environmental
Home location	-0.70	(-2.3, 0.94)	0.60	(-1.6, 2.8)
Car ownership	0.62	(-1.0, 2.3)	-1.3	(-3.3, 0.67)
Home—games console	0.90	(-1.0, 2.8)	-0.91	(-3.2, 1.4)
Home—active games console	-0.89	(-2.4, 0.65)	1.7	(-0.13, 3.5)*
Bedroom—electronic media	0.0026	(-0.62, 0.62)	0.16	(-0.59, 0.91)
Bedroom—active games console	1.3	(-1.6, 4.2)	2.4	(-0.95, 5.8)
Social
School travelȁsocial context
Accompanied by an adult (ref)
Alone	0.11	(-3.2, 3.4)	-0.63	(-4.5, 3.3)
Friend/Sibling	0.37	(-1.2, 2.0)	0.73	(-1.2, 2.7)
Social support for limiting SB	-0.16	(-0.59, 0.27)	0.34	(-0.20, 0.89)
Psychological
Negative perception of SB	-0.12	(-0.56, 0.31)	0.00044	(-0.53, 0.54)
Positive perception of SB	0.25	(-0.19, 0.70)†	-0.082	(-0.63, 0.47)
Self-efficacy for SB change	0.08	(-0.39, 0.55)	-0.27	(-0.85, 0.31)
Enjoyment of SB
No (ref)
Don’t know	0.79	(-1.3, 2.9)	1.0	(-1.5, 3.6)
Yes	2.0	(0.15, 3.9)**	0.69	(-1.7, 3.0)

β, beta coefficient; 95% CI, 95% confidence interval; ref, reference group.

* p<0.1;

** p<0.05;

^† evidence of interaction with sex.

^a After-school defined as 3–11pm Monday to Friday.

Models adjusted for: age (continuous), sex (male, female), body mass index (continuous).

After-school (n = 289–306) and weekend (n = 238–251) analytical samples vary due to missing data for individual determinants.