Table 5.

Internal consistency, 2-week test-retest reliability, and measurement error of the SHI

Subscale	Chronbach’s α	ICC (2, 1) (95% CI)	SEM	MDC
Sleep disturbing B/E	.74	.77 (.73-.89)	2.08	5.75
Irregular sleep-wake schedule	.70	.83 (.76-.88)	1.32	3.65
Total	.75	.83 (.73-.89)	2.71	7.49

Note: ICC: intraclass correlation coefficient; SEM: standard error of measurement; MDC: minimum detectable change; B/E: behavior and environment.