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Table 1 Demographic data of the included women regarding (maternal age, gestational age, gravidity, and parity)

From: Values and validity of fetal parameters by ultrasound and Doppler as markers of fetal lung maturity

  Range Mean ± SD
Maternal age 20–37 27.98 ± 4.37
Gestational age 30–37 35.45 ± 1.72
Gravidity 1–6 2.17 ± 1.06
Parity N %
Nullipara 31 25.8
 1 42 35
 2 27 22.5
 3 11 9.2
 ≥ 4 9 7.5
History of previous abortion 23 19.2