Table 4.

Mediation analyses between treatment assignment and physical function and pain

Outcome	Predictor	Mediator	Indirect effect	Direct effect	Ratio of indirect to direct	Sobel test p value
Change in 6MWT (m)	D+E versus E	aDuration Chg	0.067	0.099	0.672	.0353*
		bBalance Chg	0.012	0.132	0.092	.5436
	D+E versus D	Duration Chg	0.087	0.237	0.365	.0196*
		Balance Chg	0.026	0.268	0.095	.1508
Change in gait speed (m/s)	D+E versus E	Duration Chg	0.085	0.082	1.030	.0083*
		Balance Chg	0.041	0.102	0.396	.0629
	D+E versus D	Duration Chg	0.072	0.053	1.372	.0338*
		Balance Chg	0.004	0.093	0.043	.7447
Change in WOMAC function	D+E versus E	Duration Chg	−0.111	−0.144	0.767	.0033*
		Balance Chg	−0.072	−0.178	0.405	.0187*
	D+E versus D	Duration Chg	−0.175	−0.049	3.603	.0003*
		Balance Chg	−0.095	−0.091	1.038	.0356*
Change in WOMAC pain	D+E versus E	Duration Chg	−0.082	−0.127	0.646	.0170*
		Balance Chg	−0.040	−0.169	0.239	.1066
	D+E versus D	Duration Chg	−0.146	−0.097	1.507	.0028*
		Balance Chg	−0.071	−0.146	0.485	.0483*

All predictors and outcomes are standardized. All models adjusted for baseline BMI, gender, and baseline values of the outcome. 6MWT Six-Minute Walk Test; WOMAC Western Ontario McMasters Universities Osteoarthritis Index.

^aDuration Chg: Self-efficacy for walking duration.

^bBalance Chg: Balance efficacy.

*p < .05.