Table 3.

Determinants of direction of disagreement of sleep parameters

Variable	Difference of sleep parameter (diary – actigraphy)
	B	Std error (B)	t	P-value
SOL
Opioid dose	−.97	2.83	−.34	.73
Age	.19	.22	.87	.38
Opioid dose x age	.88	.27	3.26	.001**
TST	−.16	.03	−4.88	.000***
Use of sleep medicationa	−1.24	11.77	−.11	.92
Evening pain rating	−.46	.14	−3.37	.001**
Sex	−1.24	11.77	−.11	.92
WASO
Opioid dose	−3.07	2.50	−1.23	.22
Age	−.12	.19	−.63	.53
Opioid dose x age	−.12	.24	−.50	.53
TST	−.26	.03	−9.16	.000***
Use of sleep medicationa	−1.16	4.56	−.25	.80
Evening pain rating	.20	.12	1.69	.09
Sex
SE
Opioid dose	1.32	.83	1.60	.11
Age	−.04	.06	−.67	.50
Opioid dose x age	−.17	.08	−2.17	.03*
TST	.10	.009	11.00	.000***
Use of sleep medicationa	−3.36	1.51	−2.23	.03*
Evening pain rating	.04	.04	.87	.39
Sex	−6.07	3.44	−1.77	.08

Note. Multiple regression analyses controlling for patient sex, total sleep time (TST), use of sleep medication, and evening pain ratings. SOL = sleep onset latency; WASO = wake after sleep onset; SE = sleep efficiency

^aUse of sleep medications entered as a dichotomous covariate (y/n) in regression model. When this variable was entered as a continuous covariate (total average lowest recommended dosage of sleep medications per day), regression results were unchanged.

^*P < .05;

^**P < .01;

^***P < .001