Table 3.

Results of the linear regression predicting Average Pain Intensity at 24 h

Step and variable	B	SE	β	t	P	95% CI for t
						Lower bound	Upper bound
Step 1
Constant	72.22	5.33		13.55	0.000	61.66	82.78
Education	−6.93	1.96	−3.05	−3.53	0.001	−10.81	−3.05
Opioid equivalents	1.35	0.43	0.27	3.11	0.002	0.49	2.21
Step 2
Constant	78.09	9.44		8.27	0.000	59.38	96.79
Education	−4.51	1.91	−0.20	−2.36	0.020	−8.29	−0.73
Opioid equivalents	1.04	0.41	0.21	2.54	0.012	0.23	1.86
Catastrophizing	0.40	0.15	0.23	2.65	0.009	0.10	0.69
Sleep	−1.31	0.46	−0.24	−2.86	0.005	−2.21	−0.40

R² = 0.15 for step 1 (p = 0.000); ΔR² = 0.13 for step 2 (p = 0.001)