Table 2.

Temporal Events Comparisons

	Coefficient	[95% conf. interval]	p
Christmas-New Year n = 353, total days = 6,080, mean (range) per participant = 17 days (1–35 days)
Sleep
Pre (cons)	479.2	[473.0, 485.4]
During	23.8	[19.0, 28.6]	<.001
Post	20.7	[15.7, 25.7]	<.001
Sedentary
Pre (cons)	597.3	[588.7, 605.9]
During	−4.5	[−10.3, 1.2]	.121
Post	12.0	[5.9, 18.0]	<.001
LPA
Pre (cons)	331.2	[321.3, 341.1]
During	−17.2	[−21.5, −12.9]	<.001
Post	−31.1	[−35.6, −26.5]	<.001
MVPA
Pre (cons)	35.5	[32.7, 38.2]
During	−1.8	[−3.8, 0.2]	.079
Post	−1.6	[−3.7, 0.5]	.130

	Coefficient	[95% conf. interval]	p
DST start n = 291, total days = 3,006, mean (range) per participant = 10 days (1–14 days)
Sleep
Pre (cons)	504.8	[497.4, 512.2]
Post	4.4	[−1.3, 10.1]	.129
Sedentary
Pre (cons)	606.3	[586.2, 626.4]
Post	−4.3	[−11.6, 3.0]	.244
LPA
Pre (cons)	292.6	[284.1, 301.0]
Post	−1.5	[−6.6, 3.5]	.552
MVPA
Pre (cons)	33.7	[30.7, 36.8]
Post	−1.0	[−3.4, 1.4]	.416
DST end n = 333, total days = 3,434, mean (range) per participant = 10 days (1–14 days)
Sleep
Pre (cons)	490.5	[484.1, 496.8]
Post	−7.2	[−12.6, −1.8]	.009
Sedentary
Pre (cons)	619.0	[609.1, 628.9]
Post	7.6	[1.0, 14.2]	.024
LPA
Pre (cons)	299.2	[291.1, 307.3]
Post	−0.5	[−5.0, 4.1]	.839
MVPA
Pre (cons)	32.9	[30.1, 35.7]
Post	−0.2	[−2.4, 2.0]	.857

Results of multilevel mixed-effects linear regression analyses (one model per movement behavior, per comparison). Models adjusted for nesting of observations within participants, within families, within study waves. Bold values indicate p < .05. Christmas-New Year: pre = 7 days prior to December 25, during = December 25 to January 1, post = 7 days post January 1. Daylight saving time (DST) end: clocks shifted backward 1 hour on April 5, 2020 and April 4, 2021, pre = 7 days prior to transition, post = 7 days post. DST start: clocks shifted backward 1 hour on October 4, 2020 and October 3, 2021, pre = 7 days prior, post = 7 days post.

Cons constant; LPA light physical activity; MVPA moderate-to-vigorous physical activity.