Risk of Placental Pathology Across Ultrasound-Defined Phenotypes of Impaired Fetal Growth in Dichorionic Twins: A Retrospective Cohort Study.

The rate of the primary outcome in the reference group (AGA, concordant growth, normal Doppler) was 12.8%.

When using a singleton chart, isolated discordance and mild SGA were not associated with the primary outcome.

In contrast, when using a twin-specific chart, both isolated discordance (32.4%, aRR 2.63[1.46-4.73]) and mild SGA (28.2%, aRR 2.43[1.30-4.51]) were associated with the primary outcome.