. Author manuscript; available in PMC: 2010 Nov 19.

Published in final edited form as: Chronobiol Int. 2009 Jul;26(5):992–1014. doi: 10.1080/07420520903044505

TABLE 2.

Spearman correlations between parent-reported sleep/wake parameters and midsleep point on free days (MSF), corrected midsleep point on free days (MSFsc), morningness/eveningness (M/E) scores, and chronotype (CT) scores (n = 152)

		MSF	MSFsc	M/E score	CT
Bedtime	SC	0.59^*	0.57^*	0.33^*	0.23^*
	FR	0.76^*	0.82^*	0.31^*	0.31^*
Time of lights-off	SC	0.68^*	0.64^*	0.43^*	0.36^*
	FR	0.86^*	0.92^*	0.40^*	0.40^*
Sleep latency	SC	0.31^*	0.31^*	0.23^†	0.29^*
	FR	0.18^†	0.19^†	0.25^†	0.29^*
Sleep onset	SC	0.70^*	0.66^*	0.46^*	0.41^*
	FR	0.87^*	0.93^*	0.42^*	0.45^*
Wake-up time	SC	0.46^*	0.45^*	0.52^*	0.40^*
	FR	0.89^*	0.75^*	0.63^*	0.59^*
Get-up time	SC	0.51^*	0.47^†	0.55^*	0.41^†
	FR	0.87^*	0.75^*	0.63^*	0.57^*
Time fully alert	SC	0.53^*	0.48^†	0.68^*	0.50^*
	FR	0.82^*	0.69^*	0.66^*	0.59^*
Sleep period	SC	− 0.37^*	− 0.32^*	−0.12	−0.18
	FR	−0.05^*	− 0.24^†	0.16	0.13
Time in bed	SC	−0.16	−0.16	0.11	0.06
	FR	0.08	−0.09	0.29^†	0.22^†
Sleep inertia	SC	0.28^†	0.21^†	0.45^*	0.27^*
	FR	−0.00	−0.03	0.28^*	0.10
M/E-score		0.584^*	0.516^*		0.672^*
CT		0.581^*	0.524^*	0.672^*

Note. Correlation coefficients are reported for scheduled (SC) and free (FR) days.

p ≤ .001.

^†

p ≤ .05.