Childcare use and the social-emotional and behavioural outcomes of late-preterm and early-term born children at age 5: An analysis of the All Our Families longitudinal cohort.

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Gestational age at birth (GA) shows an inverse gradient of risk with social-emotional and behavioural outcomes among children born late preterm (≥ 34 and < 37weeks) and early term (≥ 37 and < 39weeks). Childcare has the potential to influence this association. This study aimed to estimate the association between GA and social-emotional/behavioural problems among children born between ≥ 34 and < 41weeks gestation, determine whether this association was modified by childcare use, and describe the relationship between childcare and behavioural and social-emotional functioning at age 5. Using data from the All Our Families cohort (n = 1324), logistic regression models were used to model the association between GA and social-emotional/behavioural problems (BASC-2 composite scales at age 5). Models were fit with interaction terms between GA and childcare variables (amount, multiplicity, and type of childcare at age 3) to assess effect modification. GA showed no significant associations with social-emotional/behavioural problems at age 5, though the type of childcare significantly modified the association between GA and externalizing and internalizing problems. Neither the number of hours spent in childcare (amount) nor the number of childcare arrangements used (multiplicity) modified the association between GA and social-emotional/behavioural problems. However, multiplicity was associated with externalizing behavioural problems (aOR = 2.09, 95% CI 1.14‒3.83). This study found no significant association between GA and social-emotional/behavioural problems at age 5, though childcare type modified this association. Factors such as using multiple childcare arrangements to meet families' childcare needs have the potential to influence a child's social-emotional and behavioural functioning at age 5.