Table 2.

T-tests for the differences between the phase markers of morning type (MT) and evening type (ET) participants

Phase marker		MT clock time (SD)	ET clock time (SD)	Difference (hours)	t value
Core temperature	Tmin	0513 (1.62)	0728 (1.87)	2.25	2.88**
Melatonin	Max	0420 (0.93)	0620 (0.7)	2.00	2.55**
	DLMO	2148 (1.4)	2436 (0.84)	2.80	5.42***
Sleep propensity	Min	2128 (3.5)	2334 (2.88)	2.10	1.5
	Max	0759 (3.83)	1120 (4.74)	3.35	1.79*
Subjective sleepiness	Min	1318 (3.28)	2229 (3.58)	9.18	6.02***
	Max	0352 (1.45)	0922 (4.33)	5.50	4.11***

Notes:

^*P < 0.05;

^**P < 0.1;

^***P < 0.001.

Abbreviations: DLMO, dim light melatonin onset; SD, standard deviation.