. 2018 May 30;41(9):zsy115. doi: 10.1093/sleep/zsy115

Table 2.

Predictors of delay discounting behavior between groups

	All HSS and all MLS
	Area under the curve ($200)				Area under the curve ($40000)
Variable	B	SE B	β	% Var	B	SE B	β	% Var
Constant	.256***	.009			.500***	.008
Income	.003	.027	.027	0.06	.007	.004	.049	0.18
Education	.014***	.004	.120	1.08	.024***	.005	.151	1.74
Fluid intelligence CR	.005***	.001	.118	1.14	.007***	.002	.115	1.21
Age	−0.001	.002	−.025	0.05	−.001	.002	−.011	0.01
Sex	.000	.013	.001	0.00	.004	.017	.007	0.00
Sleep duration	.027***	.005	.152	2.13	.045***	.008	.179	3.00
Daytime dysfunction	.010	.006	.050	0.24	.010	.008	.036	0.12
R ²				0.077				0.105
F				12.51***				17.607***
	HSS-NRD and MLS-NRD
	Area under the curve ($200)				Area under the curve ($40000)
	B	SE B	β	% Var	B	SE B	β	% Var
Constant	.250***	.008			.492***	.018
Income	−.001	.004	−.016	0.02	.001	.006	.009	0.01
Education	.016**	.005	.147	1.66	.027***	.007	.169	2.19
Fluid intelligence CR	.006**	.002	.142	1.63	.008**	.003	.136	1.49
Age	.003	.002	.056	0.27	.003	.003	.039	0.13
Sex	−.007	.018	−.018	0.03	.013	.026	.022	0.04
Sleep duration	.025**	.008	.137	1.80	.039**	.011	.145	1.99
Daytime dysfunction	-	-	-	-	-	-	-	-
R ²				0.088				0.103
F				8.249***				9.819***
	HSS-RD and MLS-RD
	Area under the curve ($200)				Area under the curve ($40000)
	B	SE B	β	% Var	B	SE B	β	% Var
Constant	.256***	.012			.496***	.021
Income	.006	.005	.067	0.35	.012	.006	.090	0.62
Education	.011*	.006	.096	0.69	.021**	.008	.131	1.30
Fluid intelligence CR	.004	.002	.089	0.66	.006*	.003	.097	0.77
Age	−.006*	.003	−.100	0.86	−.005	.003	−.061	0.32
Sex	.005	.018	.013	0.02	−.005	.024	−.008	0.01
Sleep duration	.029***	.008	.165	2.53	.050***	.010	.209	4.04
Daytime dysfunction	.011	.010	.049	0.22	.018	.013	.057	0.31
R ²				0.077				0.114
F				6.401***				9.871***

Sex: male = 0, female = 1. CR = correct responses. B = unstandardized. % Var = percent of unique variance (squared semi-partial correlations). Predictors are centered about their means. Predictors satisfying Bonferroni-corrected p < 0.007 are bolded.

*p < 0.05, **p < 0.01, ***p < 0.001.