Table 2.

Univariate linear regression analysis of participant characteristics and questionnaire responses as predictors of activity monitor response rate.

Predictor	Regression coefficient (95% CI)	P value	R2 (%)
Age	–0.5 (–1.9 to 0.9)	.46	4
Gender	23.6 (–7.8 to 55.1)	.13	15
Education	4.4 (–5.3 to 14.1)	.35	8
Pain duration	–0.02 (–0.3 to 0.2)	.89	0.2
Weekly pain rating	5.8 (–0.1 to 11.7)	.05	23
Patient-Specific Functional Scale	4.1 (–2.4 to 10.5)	.20	11
Roland Morris Disability Questionnaire	–0.9 (–4.7 to 2.9)	.62	0.2
Pain Self-Efficacy Questionnaire	1.0 (–0.3 to 2.3)	.14	14
Coping Strategies Questionnaire	–2.1 (–4.5 to 0.2)	.08	20