Table 2.

Results of linear mixed-effects model assessing predictors of DNIC

Variable	Standardized β	SEM	Unstandardized β	t-value	p-value
Age	−.06	.12	−.001	−0.5	.64
Body Mass Index	.−.15	.10	−.007	−1.5	.15
Time	−.07	.09	−.03	−0.7	.48
Day	−.09	.09	−.03	−1.0	.32
Sleep Variables
PLM Index	−.12	.11	−.004	−1.0	.25
Stage 2 %	.05	.11	.001	0.4	.68
Bruxism Index	.06	.09	.003	0.6	.54
PSG Sleep Efficiency*	.23	.11	.60	2.0	.04
PSG Total Sleep Time*	.24	.11	.001	2.1	.04

^*Note: The estimates for Sleep Efficiency and Total Sleep Time were derived from separate models; the two variables are highly correlated and could not be included together in a model.