Validation of the Psychosocial Assessment Tool Sibling Module Follow-Up Version.

Objective: Psychosocial screening is recommended to connect siblings of youth with cancer to psychosocial services, but the lack of validated sibling-specific screening tools is a barrier to routine screening. The current study aimed to validate and establish a clinical cutoff for the recently developed Psychosocial Assessment Tool (PAT) Sibling Module follow-up version to address this barrier.

Methods: Parents (N = 246) completed the PAT Sibling Module follow-up version for all siblings within their families ages 0-17 years (N = 458) at three time points between 6- and 24-month post-cancer diagnosis. For one target sibling within each family aged 8-17 years, parents also completed the Strengths and Difficulties Questionnaire, and the target sibling completed the Child PTSD Symptom Scale. Cross-sectional and longitudinal analyses examined internal consistency and convergent and predictive validity. Receiver operator characteristic analyses were used to establish a maximally sensitive and specific clinical cutoff.

Results: Internal consistency was acceptable for all age versions (Kuder-Richardson 20s ≥ 0.79), except for the ages 0-2 version, which had low internal consistency at 18 months post-diagnosis (Kuder-Richardson 20 = 0.57). Convergent (r values >0.7, p values <.001) and predictive (r values >0.6, p values <.001) validity were strong at each time point. An optimal clinical cutoff of 0.32 was identified (range: 0.00-1.00).

Conclusions: The PAT Sibling Module follow-up version is a reliable and valid screener for sibling psychosocial risk following cancer diagnosis. Validation of a sibling-specific screener and establishment of a clinical cutoff are necessary first steps to addressing siblings' unmet psychosocial needs and improving trajectories of sibling functioning.