. 2016 Mar 16;18:68. doi: 10.1186/s13075-016-0954-9

Table 7.

Hierarchical linear regression predicting the function outcome variables, 6-Minute Walk Test (6MWT) and Five Time Sit To Stand (5TSTS), controlling for age, BMI, pain catastrophizing, fear of movement, anxiety, and depression

		6MWT			5TSTS
		Adj. R²	Change (Δ) in R²	p value R² change	Adj. R²	Change (Δ) in R²	p value R² change
Step 1	Control variables	0.31 **			0.05
Step 2A: pain only	Resting	0.35 **	0.04	0.26	0.05	0	0.34
	Movement	0.40 **	0.09	0.001	0.08 *	0.03	0.05
	Change	0.33 **	0.02	0.1	0.06	0.06	0.25
Step 2B: fatigue	Resting	0.35 **	0.04	0.01	0.10 *	0.05	0.03
	Movement	0.38 **	0.07	0.001	0.20 **	0.15	<0.001
	Change	0.32 **	0.01	0.17	0.10 *	0.05	0.02
Step 3: pain and fatigue	Resting	0.35 **	0.02	0.35	0.09 *	0.04	0.62
	Movement	0.42 **	0.11	0.17	0.20 **	0.15	0.71
	Change	0.33 **	0.02	0.39	0.10*	0.05	0.71

Control variables: age, body mass index (BMI), pain catastrophizing (PCS), fear of movement (TSK), anxiety (PROMIS Anxiety), and depression (PROMIS Depression)

R² significance level: **p ≤ 0.01 level; *p ≤ 0.05 level