Longitudinal latent classes of maternal depression. One-class model: entropy=not applicable (n.a.), Bayesian Information Criterion (BIC)=320814.32, Lo–Mendell–Rubin likelihood ratio test (LMR-LRT)=n.a.; two-class model: entropy=0.84, BIC=303650.96, LMR-LRT=0.0000; three-class model: entropy=0.81, BIC=298662.28, LMR-LRT=0.0000; four-class model: entropy=0.78, BIC=297433.04, LMR-LRT=0.0000; five-class model: entropy=0.78, BIC=296784.33, LMR-LRT=0.4625.