A power analysis for an independent-groups t-test with a medium effect size (Cohen’s d = 0.5) shows that a final sample of 160 (80 per group) would have Power > .80 with alpha = .05 and a two-tailed test. Based on an estimated 75% recruitment and 15% attrition rate at each follow up, we plan to approach 300 caregivers and enroll 225 to achieve a final sample of 160 dyads completing the 8-week assessment for analyses of hypotheses (80 participants in intervention, and 80 in control conditions).

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