. 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 4.

Spearman correlations between actigraphic estimates ofsleep/wake parameters and parent reports of mid-sleep point on free days (MSF/MSFsc), morningness/eveningness scale (M/E) scores, and chronotype (CT) scores (n = 85)

Actigraphy		Children’s ChronoType Questionnaire (CCTQ)
Actigraphy		MSF	MSFsc	M/E	CT
Bedtime	SC	0.70^*	0.72^*	0.39^*	0.30^†
	FR	0.74^*	0.74^*	0.44^*	0.40^*
Sleep latency	SC	0.05	−0.03	0.003	0.01
	FR	−0.04	−0.05	0.09	0.15
Sleep start	SC	0.70^*	0.70^*	0.41^*	0.32^†
	FR	0.75^*	0.74^*	0.45^*	0.43^*
Sleep end	SC	0.46^*	0.45^*	0.45^*	0.34^†
	FR	0.64^*	0.56^*	0.65^*	0.51^*
Assumed sleep	SC	− 0.49^*	− 0.51^†	−0.10	−0.10
	FR	− 0.31^†	− 0.38^*	0.05	0.00
Midsleep point	SC	0.67^*	0.66^*	0.50^*	0.37^*
	FR	0.78^*	0.73^*	0.57^*	0.50^*
MSFsc		0.73^*	0.70^*	0.52^*	0.47^*

Note. SC = scheduled days; FR = free days

p ≤ .001

^†

p ≤ .05