Table 2.

Correlation between dosage and outcome variables.

Variable	T1 (posttreatment)		T2 (1-month follow-up)
	r a	P value		r	P value
Pain intensity	−0.393b	.01		−0.599b		<.001
Pain interference	0.217	.17		−0.180		.31
Pain self-efficacy	0.081	.61		0.122		.49
Depression	−0.564b	<.001		−0.726b		<.001
Anxiety	−0.316c	.04		−0.070		.70
Stress	−0.310c	.05		−0.040		.82

^ar is calculated using the Pearson correlation. Guideline: small, r=0.10 to 0.29; medium, r=0.30 to 0.49; large, r=0.50 to 1.0.

^bCorrelation is significant at .01 level (two-tailed).

^cCorrelation is significant at .05 level (two-tailed).