Accelerometer-measured physical activity and sedentary time among children and their parents in the UK before and after COVID-19 lockdowns: a natural experiment

Table 5 Modelled difference in child weekday MVPA between Wave 0 and Wave 1

	Difference between Wave 0 and Wave 1			Interaction effect (interaction with Wave)
	Estimate	95% CI	p-value^a	Estimate	95% CI	p-value^b
Model 1: unadjusted	-6.7	(-11.0, -2.3)	0.003
Model 2: adjusted	-7.7	(-11.9, -3.5)	< 0.001
Model 3: adjusted + z-BMI^c	-6.5	(-10.8, -2.3)	0.002
Model 4: gender interaction	-7.9	(-12.7, -3.2)	0.001	0.6	(-4.2, 5.3)	0.818
Model 5: education interaction	-7.5	(-12.2, -2.8)	0.002	-0.4	(-5.4, 4.6)	0.876
Model 6: z-BMI interaction^c	-6.2	(-10.5, -1.9)	0.005	-0.6	(-2.9, 1.6)	0.579

All models are adjusted for accelerometer wear time, seasonality and remote data collection
Models 2 & 3 also control for gender, age and household education
^ap-value for a test for a difference between Wave 0 and Wave 1
^bp-value for a test for an interaction effect
^cz-BMI models use multiple-imputed data: see text for details
Wave 0: Mar 2017-Jul 2018; Wave 1: May 2021-Dec 2021
CI confidence interval, MVPA moderate-to-vigorous physical activity, CMO Chief Medical Officer, PA physical activity, z-BMI Body Mass Index standardised z-score

ISSN: 1479-5868