Table 2.

Results of hierarchical regression analysis predicting PSQI global score and three PSQI factors and R² change for each block (unstandardized regression coefficients are presented)

	PSQI global			Sleep efficiency			Sleep quality			Daily disturbances
	R2 change	B	P	R2 change	B	P	R2 change	B	P	R2 change	B	P
Block 1
Sex	0.0576**	−0.864	0.06	0.0581*	−0.007	0.962	0.0351	−0.199	0.01	0.0255	−0.156	0.011
Age		0.062	0.002		0.02	0.002		0.0004	0.911		0.001	0.675
Education		−0.006	0.736		0.0007	0.901		−0.002	0.548		0.0009	0.676
Employed		0.343	0.424		0.083	0.537		0.043	0.557		−0.07	0.23
Ethnicity		−0.061	0.787		0.07	0.331		−0.049	0.207		−0.042	0.175
Family history		−0.256	0.534		−0.107	0.41		−0.067	0.344		−0.072	0.207
Block 2
Depression (BDI-II)	0.0656***	0.096	0.001	0.0824***	0.033	0.0001	0.0427**	0.01	0.047	.0529***	0.008	0.037
Anxiety (BAI)		−0.04	0.125		−0.012	0.177		−0.003	0.475		−0.002	0.645
Block 3
Nicotine dependence (FTND)	0.0121*	−0.002	0.056	0.0089	0.0003	0.285	0.0117a	−0.0001	0.572	.0472***	−0.0002	0.089
Block 4
Alcohol problem severity	0.0912***	1.11	<.001	0.0132*	−0.138	0.043	0.0745***	0.18	<.001	.2179***	0.277	<.001

*P < .05.

**P < .01.

***P< .001.

^aTrend.

Bold items are significant, italic items are trend.