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A small convenience-sampled cross-sectional study (n=97) in a single region identifying associations with presenteeism via survey instruments, without causal design or hard clinical outcomes, and acknowledged by authors as non-causal.
Secondary analysis of a prospective cohort identifying a potential mechanistic pathway (hepatic steatosis) linking pre-pregnancy obesity to GDM in an Asian population, with threshold effects and synergistic interactions, but limited by observational design and single-population generalizability.