[Retracted] The Role and Clinical Value of Optimized Fetal Main Pulmonary Artery Doppler Parameters in the Diagnosis and Prognosis Monitoring of Neonatal Respiratory Distress Syndrome

Table 2

Comparison of Doppler parameters of fetal main pulmonary artery in different gestational weeks [].

Group	N	AT (ms)	ET (ms)	AE/EY ratio
<34 weeks	196	39.16 ± 4.42^, #	187.23 ± 12.31^, #	0.21 ± 0.02^, #
34 weeks 36+6 weeks	95	42.98 ± 2.71^, #	176.13 ± 8.89	0.26 ± 0.02
≥37 weeks	81	46.08 ± 3.54^,	176.32 ± 8.13	0.24 ± 0.01^,
F		123.436	137.625	198.316
P		<0.05	<0.05	<0.05

Note: compared with <34 weeks, ; compared with 34 weeks, 36^{+ 6} weeks,; compared with ≥37 weeks, ^#.