Table 5. Comparison of subjective and objective sleep/circadian measures.

M (SD)	Accelerometry	Subjective	t	p	R	p
Sleep onset–weekdays	22:37 (50.9)	22:07 (50.4)	3.95	<0.001	0.33	0.009
Wake time–weekdays	07:02 (38.8)	07:07 (34.4)	1.06	0.292	0.62	<0.001
Sleep onset–weekends	23:30 (71.3)	23:24 (89.0)	0.46	0.647	0.16	0.220
Wake time–weekends	08:24 (72.9)	09:16 (86.2)	4.06	<0.001	0.22	0.082
Sleep window duration–weekdays	8.45 (1.14)	8.93 (1.14)	2.89	0.005	0.42	<0.001
Sleep window duration—weekends	8.91 (1.23)	9.83 (1.76)	3.75	<0.001	0.13	0.310
Social jetlag	1.12 (0.84)	1.71 (1.05)	3.45	0.001	0.02	0.903

SD = standard deviation. Values for sleep onset and wake times are time (24hr clock), and in brackets, SD in minutes