Effect and cost of an after-school dance programme on the physical activity of 11–12 year old girls: The Bristol Girls Dance Project, a school-based cluster randomised controlled trial

Table 3 Means and standard deviations by trial arm and linear mixed model adjusted for imbalance at baseline for Weekday MVPA at T1 and T2

	Control			Intervention
	n	Mean	SD	n	Mean	SD	Intervention vs Control adjusted difference in means (95 % CI)*	P value
T2 Mean weekday MVPA^a	262	53.15	19.61	246	56.55	21.92	−1.52 [−4.76 to 1.73]	0.359
T1 Mean weekday MVPA^b	265	57.69	19.39	256	60.46	22.98	−1.52 [−5.03 to 1.98]	0.395
T2 MVPA weekday CACE analysis	508	-	-	-	-	-	−4.79 [−14.53 to 4.96]	0.336
T1 MVPA weekday CACE analysis	521	-	-	-	-	-	−4.86 [−18.41 to 6.91]	0.365

^aPrimary comparison
^bKey secondary outcome
*For between group differences the control group is the reference group with models adjusted for baseline mean weekday MVPA, Local Education Authority, school size, school level deprivation, school level baseline MVPA, the number of total valid week days at T0, the number of total valid week days at T2 (or T1) and school-level clustering
MVPA moderate-to-vigorous physical activity
CACE complier Average Casual Effect (Instrumental variable regression model).
T1 – 20-week follow-up
T2 – one-year follow-up

ISSN: 1479-5868