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. 2017 Feb 10;40(3):zsx006. doi: 10.1093/sleep/zsx006

Table 4.

Intraclass Coefficients for School Night, Weekend, and Weekly Sleep Estimates.

	School night sleep					Weekend sleep		Weekly
	1 night	2 nights	3 nights	4 nights	5 nights	1 night	2 nights	7 nights
Bedtime
Australia	.56	.73^a	.80^b	.83^b	.87^b	.47	.64^a	.80^b
United States	.50	.69^a	.74^a	.79^b	.83^b	.34	.51	.79^b
United States (S)	.53	.52	.71^a	.81^b	.85^b	.41	.59	.81^b
Qatar	.38	.77^a	.73^a	.80^b	.75^b	.27	.43	.69^a
United Kingdom	.47	.47	.67^a	.77^b	.82^b	.22	.36	.74^a
SOL
Australia	.28	.33	.56	.63^a	.66^a	.29	.45	.73^a
United States	.41	.63^a	.69^a	.78^b	.78^b	.40	.57	.77^b
Qatar	.41	.61^a	.68^a	.79^b	.78^b	.20	.34	.82^b
United Kingdom	.52	.72^a	.81^b	.84^b	.85^b	.49	.66^a	.85^b
Sleep duration
Australia	.34	.53	.63^a	.69^a	.72^a	.19	.31	.68^a
United States	.23	.39	.45	.56	.60^a	.04	.08	.43
United States (S)	.42	.68^a	.72^a	.82^b	.79^b	.20	.33	.69^a
Qatar	.27	.38	.52	.62^a	.65^a	.18	.30	.58
United Kingdom	.53	.65^a	.79^b	.84^b	.85^b	.30	.47	.80^b
WASO
Australia	.16	.22	.29	.38	.50	.14	.24	.55
Wake time
Australia	.29	.39	.54	.61^a	.67^a	.41	.58	.61^a
United States	.20	.36	.36	.49	.55	.20	.36	.44
United States (S)	.21	.35	.39	.48	.57	.22	.37	.37
Qatar	.20	.23	.36	.48	.55	.31	.47	.41
United Kingdom	.42	.56	.67^a	.73^b	.79^b	.42	.59	.65^a

United States (S) indicates the subsample of 55 US adolescents.

^aIndicates good reliability (ICC = .60–.74).

^bIndicates excellent reliability (ICC ≥ .75).