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Estimated difference in probability (∆P, percentage points) of childhood atopic medication purchase at ages 0–15 by birth order and number of siblings. Results from total population models with 95% confidence intervals. M1 is adjusted for: child’s sex, birth year, and immigrant background. M2: M1 + region and urbanicity of residence. M3: M2 + household incomeand parental education. M4: M3 + mode of delivery and parental atopic medication purchases
