Table 2.
Dichotomous and continuous variables for samples with normal chromosomes.
| variable | Dichotomous variables: group (number) | Continuous variables (number) |
|---|---|---|
| Age | N group (N = 37) vs AMA group (N = 16) | 22–43 years old (N = 53) |
| PH | N group (N = 45) vs A group (N = 8) | – |
| Hb | N group (N = 37) vs A group (N = 16) | 82–137 g/L (N = 53) |
| WBC | – | 5.17–12.3 g/L (N = 53) |
| PLT | – | 125-366 *109/L (N = 53) |
| PT | – | 9.3–14.1 s (N = 53) |
| APTT | – | 18.9–35.8 s (N = 53) |
| FIB | – | 2.93–4.96 g/L (N = 53) |
| B-Scan | N group (N = 46) vs A group (N = 7) | – |
| GAA | S group (N = 47) vs T group (N = 6) | 132-230 D (N = 53) |
| GAD | – | 232-289 D (N = 51) |
| Interval | – | 91-154 D (N = 45) |
| PO | N group (N = 14) vs PTB group (N = 3) | – |
| FS | M group (N = 29) vs F group (N = 22) | – |
| BW | – | 2250–4570 g (N = 51) |
PH: pregnancy history, WBC: white blood cell count, Hb: Hemoglobin, PLT: Platelet count, PT: Prothrombin time, APTT: activated partial thromboplastin time, FIB: Fibrinogen, B-Scan: B-scan ultrasonography, Chr: Chromosome structure, PO: Pregnancy outcome, GAA: Gestational age of amniocentesis, S: Second trimester, T: Third trimester, GAD: gestational age of deliver, Interval: Interval between GAA in second trimester and GA, PTB: Preterm birth, FS: Fetal sex, BW: Birth weight, M: Male group, F: Female group, D: Days, s: seconds, N: Normal, A: Abnormal. Variable selection description: Owing to the limited occurrence of PLT anomalies, with only three cases, where two cases (310 × 10^9/L and 308 × 10^9/L) were slightly above the normal range (100-300 × 10^9/L), and one case was 366 × 10^9/L, analysing them as an abnormal group within dichotomous variables would be impractical. Hence, they were analysed exclusively as continuous variables. Similarly, though PT anomalies reached five cases, four (9.3, 9.3, 9.5, 9.6 s) were marginally below the lower limit of the normal range (14–28 weeks: 9.7–13.5 s; >28 weeks: 9.6–12.9 s), while one case (14.1 s) slightly exceeded the normal range. Acknowledging the negligible margin of error in clinical testing, this study regarded PT as a continuous variable.