Table 2.

Summary of regression analyses of Poor Sleep Quality and Daytime sleepiness factor scores.

		Poor sleep quality				Daytime sleepiness–analysis 1				Daytime sleepiness–analysis 2
	Variable	ΔR2	Tot. R2	βa	p	ΔR2	Tot. R2	β	p	ΔR2	Tot. R2	β	p
Step 0/1	PSQ	–	–	–	–	–	–	–	–	0.304∗∗	0.304	0.551	0.000
Step 1/2	Age	0.027∗	0.027	0.088	0.135	0.038∗∗	0.038	0.067	0.50	0.024∗∗	0.327	0.019	0.695
	Sex (female = 1)			0.126∗∗	0.009			0.011	0.820			−0.058	0.149
	Work status			0.142∗∗	0.046			0.226∗∗	0.000			0.149∗∗	0.003
Step 2/3	Past Positive	0.129∗∗	0.156	0.078	0.121	0.124∗∗	0.166	0.058	0.247	0.039∗∗	0.367	0.020	0.646
	Past Negative			0.163∗∗	0.010			0.214∗∗	0.001			0.135∗	0.014
	Present Hedonistic			−0.097	0.055			0.028	0.567			0.075	0.086
	Present Fatalistic			−0.044	0.442			−0.085	0.134			−0.064	0.199
	Future Positive			−0.077	0.126			−0.085	0.090			−0.048	0.277
	Future Negative			0.289∗∗	0.000			0.248∗∗	0.000			0.109	0.055

^aValues are for first entry, ^∗p < 0.05, ^∗∗p < 0.01. PSQ, Poor Sleep Quality.