TABLE 2.

Sleep, chronotype, and mood questionnaire summary results for the total sample

	n	M	SD	Max–Min
CSM	233	39.35	7.13	17–53
PSQI Total	234	2.44	1.81	0–11
Sleep onset	234	23:03 h	01:07 h	21:00–04:00 h
Wake time	234	06:31 h	01:13 h	02:56–11:00 h
Seasonality	229	6.502	3.951	0–21
Sleep duration (h)	234	6:51 h	0:52 h	03:00–9:00 h
BDI-II	234	3.73	4.23	0–29
CES-D	232	7.34	6.81	0–39

Missing data are reflected by n’s, as a few participants did not complete all measures used in this study. Specifically, one person did not complete the CSM, five did not complete the M-SPAQ, and two did not complete the CES-D. CSM is the total score on the Composite Scale of Morningness. Maximum and minimum scores obtained on each scale are listed in the “Max–Min” column. PSQI Total reflects the sum of seven component subscales, and is detailed in Buysse et al. (1989). A score >5 indicates “poor” sleepers, which is higher than our mean of 2.44 on the PSQI total score. Sleep onset, sleep duration, and wake time are taken from the PSQI. Seasonality is measured by the global seasonality score from the Modified Seasonal Pattern Assessment Questionnaire. BDI-II is the Beck Depression Inventory–2nd Edition (Beck et al., 1996) and CES-D is the Center for Epidemiologic Studies—Depression Scale (Radloff, 1977).