Although statistically, not all of the periods, such as the 7th–9th ( r =0.411, P =0.052) postnatal day, showed significance, but even during this period, the P value was nearly statistically significant.
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Correlation of B-type natriuretic peptide levels and echocardiographic parameters in preterm infants with patent ductus arteriosus.
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The sentences
On strict statistical analysis, all the periods did not show significant correlations between the PDA/LPA ratio and BNP levels (PNA 4, 4th postnatal day; r =0.526, P =0.053), but they continued to show a positive trend of correlation as post-natal age increased, with the Spearman correlation coefficient ranging from 0.422 to 0.586, and the P value ranging from <0.001 to 0.053 ( Fig. 2 ). 4.