Table 2.

Correlations between subgroups of participants depending on their DLMO times, before and after 22:00 with sleep diary variables (onset, midsleep, and wake-up time) and depressive symptoms. DLMOs, sleep variables, and depressive symptoms are shown as averages (SD) and (range). The symbol * indicates statistical significance.

Insomnia Subgroups	DLMO	Sleep Onset Time	r p Values	Midsleep	r p Values	Wake-Up Time	r p Values	Depressive Symptoms	r p Values
DLMO <22:00 (n = 69)	20:30 (0:54) (17:48–21:48)	23:00 (1:00) (20:48–2:12)	0.196 p = 0.107	2:42 (0:54) (0:12–5:12)	0.276 p = 0.022 *	6:18 (1:12) (2:00–9:06)	0.256 p = 0.034 *	10.6 (5.4) (3–23)	−0.225 p = 0.063
DLMO ≥22:00 (n = 29)	23:00 (0:54) (22:00–0:54)	1:30 (1:06) (21:30–2:24)	0.097 p = 0.616	3:12 (1:12) (0:24–5:18)	−0.097 p = 0.943	6:54 (1:42) (1:36–9:36)	−0.205 p = 0.286	10.7 (5.9) (2–23)	0.089 p = 0.645