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Table 4 Correlation of MPA Doppler indices with advancing gestational age

From: Validity of foetal Doppler indices in predicting postnatal respiratory distress syndrome: a prospective study

  G AGE At/Et PSV PI
Spearman's rho
G AGE Correlation Coefficient 1.000 0.229 0.973  − 0.317
  Sig. (2-tailed) 0.022 0.000 0.001
  N 342 342 342 342
At/Et Correlation Coefficient 0.229 1.000 0.240  − 0.017
  Sig. (2-tailed) 0.022 0.016 0.864
  N 342 342 342 342
PSV Correlation Coefficient 0.473 0.240 1.000 -0.355
  Sig. (2-tailed) 0.000 0.016 0.000
  N 342 342 342 342
PI Correlation Coefficient  − 0.317  − 0.017  − 0.355 1.000
  Sig. (2-tailed) 0.001 0.864 0.000
  N 342 342 342 342
RI Correlation Coefficient  − 0.313 0.103  − 0.020 0.048
  Sig. (2-tailed) 0.901 0.309 0.845 0.638
  N 342 342 342 342