Table 2.

Descriptive statistics and correlations of model variables.

		M	(SE)	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Scheduled-Day Sleep Duration
1.	T1	7.46	(1.29)	—
2.	T2	7.44	(1.40)	.42*	—
3.	T3	7.33	(1.35)	.34*	39*	—
4.	T7	7.83	(2.02)	.09*	.10*	.14*	—
Unscheduled-Day Sleep Duration
5.	T1	9.28	(1.83)	.16*	.10*	.10*	.12*	—
6.	T2	9.29	(1.92)	.12*	.23*	.10*	.12*	.35*	—
7.	T3	9.04	(1.71)	.16*	.12*	.28*	.06*	.34*	.39*	—
8.	T7	8.89	(1.97)	.02	.05	.07*	.26*	.14*	.18*	.21*	—
Chronotype
9.	T1	4.47	(1.39)	−.11*	−.10*	−.07*	−.03	−.25*	−.06*	−.04	.02	—
10.	T2	4.45	(1.40)	−.12*	−.06*	−.11*	−.02	−.06*	−.23*	−.05	.00	.52*	—
11.	T3	4.47	(1.37)	−.11*	−.11*	−.04	−.06*	−.06*	−.10*	−.26*	−.03	.47*	.49*	—
12.	T7	4.63	(1.67)	−.11*	−.10*	−.14*	.21*	.01	.02	−.01	−.16*	.19*	.21*	.22*	—
General Health
13.	T1	2.17	(.83)	−.06	−.05	−.02	−.01	−.02	.01	.01	.01	−.01	.01	−.01	.04	—
14.	T7	2.78	(.76)	.05	.04	.09*	.02	.02	.02	.03	.01	−.02	−.02	−.01	−.12*	.29*	—
Depressive Symptoms
15.	T1	51.12	(9.97)	−.10*	−.07	−.07	.03	.03	−.01	−.06	−.01	.07	.04	.04	.07	.31*	.20*	—
16.	T7	49.76	(11.96)	−.10*	−.04	−.06*	−.04	−.03	.03	−.02	−.08*	.04	.05	.02	.15*	.14*	−.32*	.30*	—
Psychosomatic Symptoms
17.	T1	2.22	(.83)	−.07	−.04	−.05	−.02	.01	−.01	−.03	−.06	.06	.05	.05	.01	.25*	.14*	.63*	.27	—
18.	T7	1.88	(.79)	−.12*	−.05	−.09*	−.02	−.04	−.01	−.03	−.04	.08*	.08*	.05	.08*	.19*	−.33*	.34*	.61*	.42*	—

*P < .001. T1 = assessment during the 10th grade, T2 = assessment during 11th grade, T3 = assessment during 12th grade, T7 = assessment 4 years after the last year of high school.