Values are expressed as geometric mean (95% confidence interval). BET: betamethasone; DC: dichorionic; MC: monochorionic; n: number of subjects; Cmax: maximum plasma concentration; tmax: time to reach Cmax; AUC0-∞: area under the plasma concentration vs time curve extrapolated to infinity; CL/F: apparent clearance; Vd/F: apparent volume of distribution. *ANOVA’s test with Tukey’s multiple comparisons test (p-value < 0.05).a Both twins were included, thus, 6 samples of umbilical vein and intervillous space were collected.