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. Author manuscript; available in PMC: 2012 Jun 20.

Published in final edited form as: Child Psychiatry Hum Dev. 2011 Dec;42(6):724–740. doi: 10.1007/s10578-011-0239-0

Table 3.

Parent reporting

Bipolar disorder (BD) versus healthy controls (HC)—weeknights						BD versus HC—weekend nights
	Mean		t-test	df	P value		Mean		t-test	df	P value
	BD	HC	t-test	df	P value		BD	HC	t-test	df	P value
Latency to sleep^a (BD = 21, HC = 18)	41.5 ± 35.4	18.1 ± 11.8	−2.9	25.0	0.008	Latency to sleep^a (BD = 21, HC = 17)	44.8 ± 51.6	15.0 ± 10.5	−2.6	22.0	0.017
No of times awake (BD = 16, HC = 14)	1.1 ± 1.1	0.4 ± 0.6	−2.4	24.6	0.024	No of times awake (BD = 18, HC = 20)	3.0 ± 3.9	3.0 ± 4.7	0.0	35.8	1.000
Total time awake^a (BD = 16, HC = 14)	52.3 ± 109.7	11.4 ± 17.8	−1.5	15.9	0.162	Total time awake^a (BD = 14, HC = 13)	25.0 ± 42.0	0	−2.2	13.0	0.044
Reported sleep^b (BD = 20, HC = 20)	8.4 ± 2.0	8.1 ± 0.9	−0.6	26.4	0.551	Reported sleep^b (BD = 20, HC = 19)	9.4 ± 1.8	9.8 ± 1.3	0.6	34.8	0.548
Calculated sleep^b (BD = 21, HC = 20)	8.6 ± 1.8	8.4 ± 0.9	−0.5	30.0	0.597	Calculated sleep^b (BD = 21, HC = 19)	9.9 ± 1.5	9.7 ± 1.5	−0.5	37.3	0.602

^a

In minutes

^b

In hours