Table 3.

Doppler data of fetuses with and without neonatal RDS

	Fetuses with RDS (n = 12)	Fetuses without RDS (n = 58)	p valuea
All gestational age
At/Et ratio mean	0.297 ± 0.026	0.352 ± 0.044	< 0.001*
PI mean	2.67 ± 0.188	2.43 ± 0.028	< 0.001*
RI mean	0.900 ± 0.013	0.882 ± 0.014	< 0.001*
PSV mean (cm s−1)	62.03 ± 4.55	66.27 ± 4.43	< 0.001*
Early preterm
At/Et ratio mean	0.280 ± 0.011	0.312 ± 0.028	0.002*
PI mean	2.73 ± 0.19	2.61 ± 0.100	0.036*
RI mean	0.899 ± 0.014	0.883 ± 0.016	0.012*
PSV mean (cm s−1)	61.93 ± 4.80	64.64 ± 4.84	0.01*
Late preterm
At/Et ratio mean	0.311 ± 0.025	0.362 ± 025	< 0.001*
PI mean	2.59 ± 0.13	2.39 ± 0.16	0.006*
RI mean	0.901 ± 0.012	0.883 ± 0.014	0.006*
PSV mean (cm s−1)	61.62 ± 4.74	66.17 ± 4.23	0.001*
Early term
At/Et ratio mean	0.345 ± 0.021	0.383 ± 0.036	< 0.001*
PI mean	2.5 ± 0.14	2.31 ± 0.16	0.158
RI mean	0.903 ± 0.004	0.879 ± 0.122	0.02*
PSV mean (cm s−1)	64.5 ± 0.707	68.15 ± 3.78	0.172

^*Significant

^aAll test was performed by independent t test