Table 5.

Meta-regression results showing the interaction between study characteristics and the standardized treatment effect on physical activity.^a

Covariate	Standardized mean difference (95% CI)	P value
Log (intervention duration [days])	0.0171 (−0.0338 to 0.0680)	.51
Log (participant mean age [years])	−0.00296 (−0.224 to 0.218)	.98
Log (sample size)	−0.0616b (−0.111 to −0.0123)	.01
Log (percentage male)	−0.0615 (−0.266 to 0.143)	.56
Log (baseline step count)	−0.420c (−0.637 to −0.202)	<.001
Log (baseline MVPAd [minutes])	−0.199c (−0.288 to −0.109)	<.001
Log (PRECIS-2e score)	−0.805f (−1.361 to −0.249)	<.001
Log (RE-AIMg score)	−0.0277 (−0.177 to 0.122)	.72
Log (risk-of-bias score)	−0.199 (−0.406 to 0.0690)	.06

^aAll covariates were log transformed; therefore, the coefficients measure the associated change in the standardized treatment effect size from a 1% increase in the indicated variable.

^bP<.05.

^cP<.001.

^dMVPA: moderate to vigorous physical activity.

^eRE-AIM: Reach, Effectiveness, Adoption, Implementation, Maintenance.

^fP<.01.

^gPRECIS-2: Pragmatic-Explanatory Continuum Indicator Summary-2.