Table 4.

Regression model predicting PROMIS Physical Functioning score

Variable	Β	t	P value	R2Δ	F(R2Δ)	P value
Block 1				0.203	61.142	<0.0001
Age (centered)	−0.13	−3.12	0.002
Level of injury	4.35	10.67	<0.0001
Block 2				0.000	0.02	0.89
Age2 (centered)	0.01	0.14	0.89
Block 3				0.016	4.82	0.008
Pain (centered)	−0.11	−2.44	0.015
Fatigue (centered)	−0.03	−0.62	0.54
Block 4				0.001	3.24	0.72
Age (centered) × pain (centered)	−0.04	−0.80	0.43
Age (centered) × fatigue (centered)	0.01	1.94	0.85
Block 5				0.007	2.19	0.11
Age2 (centered) × pain (centered)	0.03	0.46	0.65
Age2 (centered) × fatigue (centered)	0.11	1.85	0.07

Overall model: F(9, 472) = 15.44, P < 0.05.