Table 4.

Comparison of the change sleep duration and timing on the weekdays and weekends between the Pre-COVID and COVID-19 cohorts.

Variable	Pre-COVID Cohorts, Baseline	Pre-COVID Cohorts, Week 12	P-value, Within Group Change	COVID Cohort, Baseline	COVID Cohort, Week 12	P-value, Within Group Change	P-value, Between Group Change
Weekdays	N=55	N=46	N=46	N=26	N=21	N=21
Time in Bed	07:21 ± 00:50	07:09 ± 00:48	0.34	07:06 ± 00:45	07:29 ± 00:57	0.09	0.04
Sleep Duration	06:50 ± 00:45	06:41 ± 00:46	0.43	06:37 ± 00:41	06:58 ± 00:54	0.11	0.06
Sleep Onset	23:07 ± 01:14	23:18 ± 01:13	0.51	23:14 ± 01:01	23:37 ± 01:12	0.03	0.10
Sleep End	06:29 ± 01:07	06:28 ± 01:06	0.86	06:20 ± 00:45	07:07 ± 01:00	<0.001	0.001
Sleep Mid-Point	02:48 ± 01:06	02:53 ± 01:05	0.82	02:47 ± 00:48	03:22 ± 01:00	<0.001	0.005
Weekends	N=55	N=44	N=44	N=25	N=21	N=20
Time in Bed	07:42 ± 01:30	07:29 ± 01:50	0.44	07:14 ± 01:26	07:23 ± 01:12	0.85	0.86
Sleep Duration	07:07 ± 01:22	06:59 ± 01:44	0.48	06:48 ± 01:21	06:50 ± 01:09	0.90	0.73
Sleep Onset	23:32 ± 01:27	23:51 ± 01:41	0.22	23:28 ± 01:09	23:58 ± 01:20	0.02	0.60
Sleep End	07:28 ± 01:10	07:32 ± 01:17	0.95	06:58 ± 01:31	07:36 ± 00:58	0.08	0.41
Sleep Mid-Point	03:30 ± 01:08	03:41 ± 01:14	0.31	03:13 ± 01:10	03:47 ± 01:01	0.01	0.28

All results reported as mean ± SD. Values in the table include all available data at each timepoint. The p-values reflect between group changes in participants that had valid sleep data at both timepoints.