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Table 2 Comparison of the maternal age, gravidity, and parity between the RDS and the non-RDS groups

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

  Range Mean ± S. D t test p value
Maternal age RDS 21–37 27.84 ± 4.59 0.153 0.879
Non-RDS 20–37 28.01 ± 4.36
Gravidity RDS 1–6 2.42 ± 1.43 1.138 0.258
Non-RDS 1–4 2.12 ± 0.98
Parity RDS 0–4 1.42 ± 1.22 0.933 0.353
Non-RDS 0 – 4 1.37 ± 1.18