Table 3.

Pooled Effect Sizes and Heterogeneity^a for IU Scales and Difference Scores for SCR During Extinction When Controlling for Trait Anxiety Scores^b

	g	95% CI	k	n	p	I2
IU-27 Scale
Early ext	−0.03	−0.16, 0.1	15	933	.661	45.3%
Late ext	0.14	−0.04, 0.33	11	479	.120	65.5%
Whole phase ext	0.31	0.13, 0.49	11	479	<.001	18.8%
Double-difference	−0.21	−0.39, −0.02	11	479	.029	52.1%
IU-12 Scale
Early ext	0.04	−0.08, 0.17	15	933	.498	46.1%
Late ext	0.28	0.10, 0.47	11	479	.002	26.9%
Whole phase ext	0.25	0.07, 0.43	11	479	.007	14%
Double-difference	−0.17	−0.35, 0.01	11	479	.066	43%
I-IU Scale
Early ext	0.004	−0.12, 0.13	15	933	.947	41.2%
Late ext	0.29	0.11, 0.47	11	479	.002	18%
Whole phase ext	0.18	0.002, 0.36	11	479	.047	16.1%
Double-difference	−0.18	−0.37, −0.003	11	479	.046	51.6%
P-IU Scale
Early ext	0.06	−0.07, 0.19	15	933	.354	32.8%
Late ext	0.23	0.05, 0.41	11	479	.013	22%
Whole phase ext	0.24	0.06, 0.42	11	479	.009	0%
Double-difference	−0.13	−0.31, 0.05	11	479	.163	19.3%

CI, confidence interval; ext, extinction; I-IU, Inhibitory IU; IU, intolerance of uncertainty; P-IU, Prospective IU; SCR, skin conductance response.

^aPercentage of variability in effect size.

^bState-Trait Anxiety Inventory–Trait or State-Trait Inventory for Cognitive and Somatic Anxiety.