Table 2.

Effectiveness estimates from mixed linear effects models

Outcome	Post intx, full sample	Post intx, upper quartile	6 months, full sample	6 months, upper quartile
Disability	β = 3.46	β = 1.04	β = 1.07	β = 5.61
	95% CI 0.87–6.04	95% CI −4.38 to 6.46	95% CI −1.92 to 4.07	95% CI −0.13 to 11.36
	P = 0.01, δ = 0.31	P = 0.71, δ = 0.09	P = 0.48, δ = 0.10	P = 0.06, δ = 0.51
Adaptive behaviour	β = 0.15	β = 0.09	β = 0.01	β = −0.106
	95% CI 0.06–0.24	95% CI −0.11 to 0.29	95% CI −0.12 to 0.13	95% CI −0.31 to 0.10
	P < 0.01, δ = 0.38	P = 0.40, δ = 0.22	P = 0.92, δ = 0.02	P = 0.32, δ = −0.27
Internalizing	β = 0.01	β = −0.22	β = 0.03	β = −0.069
	95% CI −0.09 to 0.10	95% CI −0.44 −0.01	95% CI −0.09 to 0.14	95% CI −0.29 to 0.15
	P = 0.91, δ = 0.01	P = 0.04, δ = −0.61	P = 0.63, δ = 0.07	P = 0.54, δ = −0.18
Externalizing	β = −0.03	β = −0.18	β = −0.01	β = −0.28
	95% CI −0.13 to 0.07	95% CI −0.42 to 0.07	95% CI −0.13 to 0.11	95% CI −0.53 to −0.03
	P = 0.54, δ = −0.07	P = 0.15, δ = −0.37	P = 0.88, δ = −0.02	P = 0.03, δ = −0.59
Emotion regulation	β = 0.11	β = 0.20	β = 0.02	β = 0.27
	95% CI 0.03–0.19	95% CI 0.01–0.39	95% CI −0.09 to 0.12	95% CI 0.07–0.46
	P = 0.01, δ = 0.31	P = 0.04, δ = 0.59	P = 0.79, δ = 0.04	P = 0.01, δ = 0.82

‘Post’ indicates interviews conducted at post-assessment, following completion of the YRI; ‘6 months’ indicates follow-up interviews conducted 6 months after post-assessments. For all outcomes, the treatment effect represents the per-item difference between treatment and control groups at post-assessment. Effect size for the treatment effect is reported as standardized mean difference (δ).