Table 2.

Results of linear regression for nightmare distress and dream recall (univariate)

	Nightmare distress			Dream recall
	Standardized coefficients	t	p value	Standardized coefficients	t	p value
	B			B
Age, years, mean (SD)	− 0.189	− 1.963	0.080	− 0.361	− 3.573	0.001
Female sex, n (%)	− 0.095	− 0.876	0.384	− 0.177	− 1.660	0.101
Married, n (%)	− 0.189	− 1.775	0.080	− 0.400	− 4.027	< 0.001
Body mass index, kg/m2	− 0.269	− 2.563	0.012	− 0.285	− 2.724	0.008
Sleep latency, minutes	0.029	0.263	0.793	0.013	0.116	0.908
Wake after sleep onset, minutes	0.141	1.304	0.196	0.158	1.463	0.147
Total sleep time, minutes	0.090	0.837	0.405	− 0.047	− 0.432	0.667
Sleep efficiency, %	− 0.052	− 0.484	0.630	− 0.088	− 0.818	0.415
Proportion of NREM sleep stage 1, minutes	− 0.100	− 0.929	0.355	− 0.090	− 0.833	0.407
Proportion of NREM sleep stage 2, minutes	− 0.019	− 0.175	0.861	0.015	0.136	0.892
Proportion of NREM sleep stage 3, minutes	0.081	0.746	0.458	0.130	1.212	0.229
Proportion of REM sleep stage, minutes	0.121	1.126	0.263	− 0.016	− 0.143	0.886
Apnea–hypopnea index, per hour	− 0.277	− 2.655	0.009	− 0.311	− 3.013	0.003
Minimal arterial oxygen saturation, %	0.296	2.854	0.005	0.185	1.735	0.086
Periodic limb movement index, per hour	0.025	0.225	0.823	0.044	0.405	0.686
Pittsburgh sleep quality index	0.223	2.107	0.038	0.147	1.372	0.174
Epworth sleepiness scale	0.114	1.062	0.291	− 0.002	− 0.016	0.987
Insomnia severity index	0.229	2.173	0.033	0.140	1.306	0.195
Beck's depression inventory	0.518	5.383	< 0.001	0.447	4.441	< 0.001
State trait anxiety inventory-state scale	0.386	3.721	< 0.001	0.390	3.768	< 0.001
Morningness–eveningness questionnaire	− 0.327	− 3.189	0.002	− 0.423	− 4.305	< 0.001

NREM nonrapid eye movement, REM rapid eye movement