Table 5.

Two-group comparison of model-based means and effect size estimates at post-treatment and two-year follow-up

Measure	Time Point	Study Group Means (SEs)	Hedges’ g Effect Size Estimates (95% CI)
		ICBT	GCBT	ICBT vs. GCBT
Child MASC	Baseline	57.27 (1.21)	58.03 (1.25)	NA
	12-Week	47.78 (1.40)	48.05 (1.35)	0.02 (−0.31, 0.35)
	2-Year	47.12 (1.18)	45.71 (1.16)	−0.13 (−0.43, 0.16)
Parent MASC	Baseline	54.77 (1.69)	58.91 (1.74)	NA
	12-Week	45.40 (2.03)	49.32 (1.95)	0.23 (−0.10, 0.57)
	2-Year	42.30 (1.80)	40.67 (1.88)	−0.10 (−0.42, 0.22)
CGAS	Baseline	51.33 (0.56)	52.10 (0.58)	NA
	12-Week	63.03 (1.04)	62.69 (1.04)	−0.04 (−0.36, 0.28)
	2-Year	69.66 (1.34)	72.91 (1.33)	0.26 (−0.03, 0.56)

Note: ICBT = individual cognitive behavioral therapy; GCBT = group cognitive behavioral therapy; CI = confidence interval; MASC = Multidimensional Anxiety Scale for Children; CGAS = Child Global Assessment Scale.

Means presented are model based mean estimated at each time point. The following covariates were included (grand mean centered) in each model: Child age (at baseline), gender, number of comorbid disorders, baseline ADIS CSR ratings for each target anxiety disorder.

For effect size estimates, calculations were based on between-groups differences in estimated mean scores at Week 12 divided by the pooled standard deviation of the outcome at Week 12, otherwise known as Hedges’ g (95% CI).