TABLE 3.

Raw estimates of children's health behaviours across measurement periods (2018–2020)

	Spring 2018				Spring 2019				Spring 2020
	Subsample		Pre‐pandemic only		Subsample		Pre‐pandemic only		Subsample
	N	M ± SD	N	M ± SD	N	M ± SD	N	M ± SD	N	M ± SD
Physical activity (min)
Light PA	45	488.8 ± 84.0	123	499.6 ± 100.3	59	478.8 ± 110.3	33	484.1 ± 101.9	70	394.4 ± 109.4
MVPA	45	78.7 ± 31.1	123	78.5 ± 36.1	59	71.2 ± 38.9	33	63.9 ± 38.7	70	60.5 ± 33.3
Sedentary behaviour (min)	45	313.8 ± 95.6	123	293.3 ± 112.8	59	327.2 ± 119.5	33	329.6 ± 123.9	70	465.9 ± 145.1
Sleep
Minutes asleep	44	470.9 ± 37.9	125	465.0 ± 50.1	58	462.7 ± 45.2	37	475.6 ± 46.1	61	476.0 ± 52.0
Bedtime	44	10:42 PM ± 51.5	125	10:50 PM ± 64.7	58	10:40 PM ± 62.0	37	10:30 PM ± 57.0	61	12:27 AM ± 115.7
Wake time	44	7:05 AM ± 43.0	125	7:07 AM ± 52.7	58	6:58 AM ± 45.7	37	6:57 AM ± 49.6	61	8:57 AM ± 109.6
Midpoint	44	2:53 AM ± 44.0	125	2:58 AM ± 52.8	58	2:48 AM ± 49.8	37	2:43 AM ± 48.2	61	4:37 AM ± 109.1
Midpoint ISD	43	73.0 ± 30.5	117	73.9 ± 38.8	55	65.1 ± 32.3	32	63.3 ± 36.4	60	89.6 ± 60.5
Screen time (min)
Total ST	45	100.5 ± 75.3	83	88.1 ± 65.5	70	105.3 ± 68.7	50	110.9 ± 79.7	74	220.2 ± 121.9
Evening ST	42	25.8 ± 38.3	82	15.0 ± 21.5	69	34.4 ± 34.8	49	34.2 ± 37.4	74	60.4 ± 56.0
Bedroom ST	41	13.9 ± 29.1	82	5.4 ± 11.9	68	16.5 ± 28.0	49	12.5 ± 18.0	74	25.6 ± 35.0
Diet
Healthy foods	45	1.5 ± 0.8	84	1.3 ± 0.7	71	1.5 ± 0.8	50	1.4 ± 0.7	74	2.0 ± 0.8
Unhealthy foods	45	2.9 ± 1.4	84	2.6 ± 1.3	71	2.8 ± 1.2	50	2.7 ± 1.3	73	4.4 ± 1.6

	Summer 2018				Summer 2019				Summer 2020
	Subsample		Pre‐pandemic only		Subsample		Pre‐pandemic only		Subsample
Physical activity (min)
Light PA	34	471.6 ± 78.5	54	475.2 ± 113.0	43	445.1 ± 108.6	17	478.4 ± 111.3	57	416.1 ± 112.9
MVPA	34	88.1 ± 44.8	54	74.1 ± 43.3	43	68.7 ± 39.1	17	102.7 ± 60.1	57	67.7 ± 38.5
Sedentary behaviour (min)	34	322.5 ± 107.1	54	315.6 ± 132.9	43	358.5 ± 134.3	17	287.8 ± 147.9	57	493.0 ± 169.4
Sleep
Minutes asleep	35	473.1 ± 60.3	55	492.0 ± 45.0	43	474.9 ± 54.6	19	490.3 ± 50.4	52	485.8 ± 49.4
Bedtime	35	11:38 PM ± 83.3	55	11:32 PM ± 76.6	43	12:02 AM ± 93.9	19	11:47 PM ± 68.9	52	12:50 AM ± 103.6
Wake time	35	8:03 AM ± 87.1	55	8:17 AM ± 80.1	43	8:35 AM ± 99.4	19	8:32 AM ± 69.6	52	9:30 AM ± 116.1
Midpoint	35	3:47 AM ± 79.6	55	3:47 AM ± 75.2	43	4:20 AM ± 92.9	19	4:03 AM ± 63.2	52	5:10 AM ± 106.5
Midpoint ISD	33	72.6 ± 41.4	53	75.8 ± 51.8	41	68.2 ± 39.9	17	60.3 ± 38.1	51	103.9 ± 89.0
Screen time (min)
Total ST	40	139.4 ± 89.6	70	123.7 ± 88.4	66	154.1 ± 97.1	37	174.2 ± 90.2	69	185.7 ± 119.3
Evening ST	40	44.9 ± 53.1	63	36.2 ± 44.0	65	57.8 ± 51.4	37	51.5 ± 47.8	69	62.3 ± 63.1
Bedroom ST	40	16.5 ± 33.5	63	12.5 ± 27.1	65	23.2 ± 33.3	37	24.3 ± 27.7	69	25.9 ± 33.4
Diet
Healthy foods	39	1.3 ± 0.8	70	1.2 ± 0.8	66	1.5 ± 0.9	38	1.6 ± 0.8	68	2.0 ± 0.8
Unhealthy foods	39	2.8 ± 1.3	70	2.6 ± 1.2	66	3.3 ± 1.4	38	3.0 ± 1.3	68	4.1 ± 1.3

Note: Pre‐pandemic only measures include children who did not re‐enroll in the 2020 subsample. Healthy foods ranged from 0 to 3 and unhealthy foods ranged from 0 to 14 with higher values indicating greater daily consumption. MVPA and Bedroom ST were winsorized at 5% due to high skew.

Abbreviation: ISD, individual standard deviation; MVPA, moderate to vigorous physical activity; PA, physical activity; ST, screen time.