Table 4.

Results of Meta-Regression Models

	All Variables Examined Together in a Single Model				Each Variable Examined Independently in a Separate Model
	Coefficient	Standard Error	Z-value	p-value	Coefficient	Standard Error	Z-value	p-value
Intercept	0.3734	0.1115	3.3494	0.0008	-	-	-	-
Naïve-Participant Interaction	0.5557	0.1544	−3.5989	0.0003	0.5113	0.0819	−6.2392	<.0001
Stress Manipulations	0.152	0.1575	0.9651	0.3345	−0.3604	0.0956	−3.769	0.0002
All Group Members Intoxicated	0.1295	0.1262	1.0262	0.3048	0.4216	0.1577	2.6732	0.0075
% Female	0.127	0.1568	0.8096	0.4182	0.1084	0.2007	0.5401	0.5892
Group size larger than 2	0.0383	0.087	0.4406	0.6595	0.1891	0.1171	1.6141	0.1065
Outcome Indexes Anxiety	−0.0383	0.1208	−0.3174	0.7509	−0.314	0.1094	−2.8694	0.0041

Naïve-Participant Interaction: 1 = Interaction involves only naïve participants, 0 = Participants interact with a scripted/identified confederate.

Covariates examined in models above were created for the purposes of disentangling the effects of the naïve-participant vs. confederate distinction from the effects of other potentially confounding factors that varied (to some extent) across studies. These results do not represent powerful independent tests of the effects of many of the covariates listed above (see discussion section).

With the exception of % female, all covariates are binary