Table 2.
Performance of traditional screening.
| Risk stratification | CFTS | quadruple screening | triple screening | double screening | ||||
|---|---|---|---|---|---|---|---|---|
| n(%) | T21(%) | n(%) | T21(%) | n(%) | T21(%) | n(%) | T21(%) | |
| high risk (risk ≥ 1/270) | 370 (1.70%) | 26 (78.79%) | 306 (3.78%) | 8 (72.73%) | 415 (3.03%) | 9 (69.23%) | 3629 (5.30%) | 42 (70.00%) |
| intermediate risk (1/1000 ≤ risk < 1/270) | 732 (3.37%) | 3 (9.09%) | 598 (7.39%) | 2 (18.18%) | 943 (6.89%) | 2 (15.38%) | 7753 (11.32%) | 13 (21.67%) |
| low risk (risk < 1/1000) | 20611 (94.92%) | 4 (12.12%) | 7183 (88.82%) | 1 (9.09%) | 12334 (90.08%) | 2 (15.38%) | 57130 (83.39%) | 5 (8.33%) |