/ GDM / health outcomes evaluation / Inter-item Covariances / Item Parameters / Item Response Probabilities / Item Subset / Latent Variable Scale / Major Depression / Pairwise Comparison Model / Parametric IRT / Polytomous Items / Proximity Models / Psychological methodology / Psychological testing & measurement / Psychological testing and measurement / PSYCHOLOGY / Assessment, Testing & Measurement / PSYCHOLOGY / Research & Methodology / psychometric assessment / Rt Modeling / Simple Sum Score / social science measurement / Sum Score / Transitive Reasoning / Van Der Ark / Von Davier