Skip to main content

Table 1 Maternal age at delivery and gestational age at time of NIPS, stratified by NIPS results

From: Positive predictive value of non-invasive prenatal screening for fetal chromosome disorders using cell-free DNA in maternal serum: independent clinical experience of a tertiary referral center

    Median Mean SD P-valuesa
Maternal age (years) I. Abnormal concordant 39.00 36.97 6.13 I vs. III 0.009**
II. Abnormal discordant 34.00 33.08 4.70 I vs. II 0.034*
III. Normal concordant 36.00 34.79 5.16 II vs. III 0.161
Gestational age (weeks) I. Abnormal concordant 13.10 14.94 3.74 I vs. III 0.156
II. Abnormal discordant 14.10 15.76 4.17 I vs. II 0.722
III. Normal concordant 13.25 15.64 3.97 II vs. III 0.627
  1. aP-values calculated using Wilcoxon rank sum test
  2. *P < 0.05
  3. **P < 0.01