Table 2b.

Summaries of the Meta-Regression Analysis for Change with Robust Variance Estimate (Correlation between Pre- and Post-Score Set as 0.8)

	Estimated coefficients β (Standard error)
	Overall Outcome Change (k = 233)	Alcohol Use Change (k = 118)	Drug Use Change (k = 91)
All recommendations included
Recommendation number linear	0.070 (0.015) ***	0.045 (0.016) **	0.080 (0.025) **
Recommendation number squared	0.000 (0.007)	−0.003 (0.003)	−0.005 (0.010)
Only main recommendations included
Recommendation number linear	0.125 (0.030) ***	0.041 (0.023)	0.177 (0.078) *
Recommendation number squared	0.020 (0.022)	0.020 (0.026)	−0.007 (0.074)

^*p < .05

^**p < .01

^***p < .001.

k is the total number of effect sizes included.