| Trisomy | CNV | Total | P | |||
---|---|---|---|---|---|---|---|
TP | FP | TP | FP | TP | FP | ||
Age | |||||||
 ≥ 35 | 9 | 4 | 2 | 18 | 11 | 22 | > 0.05* |
 <35 | 7 | 8 | 11 | 4 | 18 | 12 | |
GA at NIPT (weeks) | |||||||
 First trimester(9–13 weeks) | 0 | 0 | 0 | 0 | 0 | 0 | / |
 Second trimester(14–27 weeks) | 1 | 9 | 13 | 22 | 14 | 31 | |
 Third trimester(≥ 28 weeks) | 0 | 1 | 0 | 0 | 0 | 1 |