Skip to main content

Table 1 The characteristics and classification of clinical specimens

From: The effect of hemolysis on quality control metrics for noninvasive prenatal testing

Classification Visual inspection Number Hemoglobin level (g/L) Maternal age in years (range) Gestational week (range) P1 P2
Group I 53 [0, 1] 30 (19–45) 16+1 (12+0–28+0)
Group II 97 (1, 2] 30 (19–50) 16+0 (12+1–27+3) 0.972 0.623
Group III 30 (2, 4] 30 (19–39) 15+4 (12+0–22+1) 0.904 0.541
Group IV 25  > 4 31 (22–41) 16+2 (12+0–19+6) 0.391 0.517
  1. P1, the comparison of maternal age to group I. P2, the comparison of gestational weeks to group I