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Longitudinal latent factor model including measured asthma outcome data at age 3 and 7 years, and a asthma polygenetic risk score (APRS). A: Additive genetic factor score, C: Shared or common environmental factor score (included at age 3), E: Non‐shared environmental factor score. APRS, asthma polygenetic risk score based on genotype information. rA =the genetic correlation between the factor scores of the two twins and equals 1 for MZ) and 0.5 for DZ pairs
