Table 3.

Zero-order correlation matrix of physical functioning, depression, fatigue, pain, and age

	1	2	3	4
1. PROMIS Physical Functioning
2. PHQ-9 Depression	−0.05
3. Average pain severity over past week	−0.09*	0.36***
4. Average fatigue over past week	−0.10*	0.53***	0.45***
5. Age	−0.12**	0.04	0.04	0.01

*P < 0.05, **P < 0.01, ***P < 0.001.