Table 1.

Descriptive statistics of study variables

Variable	Min-Max	Mean	SD	Variance	Skewness	Kurtosis
Child age	8.27–17.94	12.73	2.88	8.34	0.01	−1.31
Overall symptoms of anxiety	2.00–94.00	41.51	17.39	302.45	0.36	0.15
Average hours of sleep per night	0.17–10.45	5.64	3.26	10.68	−0.80	−0.87
Average onset latency (minutes)	0.00–61.17	13.60	13.56	184.00	1.88	3.71
Average sleep efficiency percentage	53.21–95.21	81.06	9.82	96.44	−1.12	0.67
Average wakefulness after sleep onset (minutes)	14.00–219.69	70.73	46.01	2116.89	1.28	1.26
Average number of awakenings	16.00–56.14	36.53	9.67	93.49	0.09	−0.59