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Figure 2. Model illustrating the second-stage of latent growth modeling for physical activity and depressive symptoms. {eta}1 and {eta}3 = initial status. {eta}2 and {eta}4 = change function. Y1 – Y6 = two variables measured on 3 occasions. {epsilon}11 – {epsilon}66 = item uniquenesses. {zeta}11 – {zeta}44 = factor variances. {psi}12 and {psi}34 = factor covariances.