Table III.

Final model with BDI scores corrected for potential confounders.

	B	95% CI of SE	SE	β	t	P
Constant	7.959	7.6 – 8.4	0.208		38.277	0
BDI (log-transformed)	−0.607	−1.13 – −0.09	0.265	−0.060	−2.296	2
Age (yrs)	−0.006	−0.05 – 0.03	0.020	0.011	−0.304	1
Sex (0 = male; 1 = female)	0.293	−0.04 − 0.63	0.170	.045	1.724	5
Interaction age X sex	−0.110	−0.17 – −0.05	0.028	−0.138	−3.873	0
Time of day (0 = AM; 1 = PM)	−0.405	−0.80 – −0.01	0.204	−0.050	−1.985	7
Current smoker (0 = no; 1 = yes)	0.613	0.19 – 1.06	0.215	0.072	2.843	5
Somatic co-morbidity (0 = no; 1 = yes)	0.515	−0.03 – 1.06	0.278	0.047	1.857	3

B, regression coefficient; CI, confidence interval; SE, standard error of the mean; β, standardized correlation coefficient.