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Figure 1. Model illustrating the first-stage of latent growth modeling for physical activity and depressive symptoms. {eta}1 = initial status. {eta}2 = change function. Y1 - Y3 = 1 variable measured on 3 occasions. {epsilon}11, {epsilon}22, and {epsilon}33 = item uniquenesses. {zeta}11 and {zeta}22 = factor variances. {psi}12 = factor covariance.