Table 6 Hierarchical linear regression models for pain, fatigue, and pain and fatigue predicting the perceived function outcome variables, FIQR-Function, MAF-ADL, and SF-36-PF, controlling for age, BMI, pain catastrophizing, fear of movement, anxiety, and depression

Step 1

Control variables

0.13 **

0.22 **

0.11 ^*

Step 2A: pain

Resting

0.29 **

0.16

<0.001

0.23**

0.01

0.11

0.17 **

0.06

0.01

Movement

0.37 **

0.26

<0.001

0.32 **

0.1

<0.001

0.33 **

0.22

<0.001

Change

0.15**

0.02

0.12

0.26 **

0.04

0.02

0.18 **

0.07

0.007

Step 2B: fatigue

Resting

0.29 **

0.16

<0.001

0.30 **

0.08

0.002

0.19 **

0.08

0.004

Movement

0.31 **

0.18

<0.001

0.39 **

0.17

<0.001

0.22 **

0.03

0.001

Change

0.13**

0

0.23

0.25**

0.03

0.33

0.12*

0.01

0.27

Step 3: pain and fatigue

Resting

0.32 **

0.11

0.03

0.29**

0.03

0.76

0.19**

0.08

0.28

Movement

0.42 **

0.29

0.006

0.41 **

0.19

≤0.001

0.34**

0.23

0.1

Change

0.14**

0.01

0.49

0.27**

0.05

0.15

0.17**

0.06

0.83