Table 3. Percentage of Variance and Cumulative Variance, Eigenvalue and Cronbach’s alpha for Each Factor of Sleep Hygiene Index.

Factors	Cronbach’s Alpha	Percentage Cumulative	Percentageof Variance	Eigenvalue
1 a (Item 1,2,3,5)	/83	44/526	44/52	5/788
2 b (Item 8,9,10)	/81	59/224	14/699	1/911
3 c (Item 4,6,7,11,12,13)	/79	67/191	7/966	1/036

^aFactor 1: Sleep-wake cycle behaviors.

^bFactor 2: Bedroom factors.

^cFactor 3: Behaviors that affect sleep.