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Positive detection rates by gestational age subgroups
| Group | Total (n) | Proportion (%) | Positive Cases (n) | Proportion (%) | Positive Rate (%) |
|---|---|---|---|---|---|
| C1 | 5393.0 | 78.36 | 374 | 70.83 | 6.93 |
| C2 | 1405.0 | 20.42 | 143 | 27.08 | 10.18 |
| C3 | 76.0 | 1.10 | 10 | 1.89 | 13.16 |
| C4 | 8.0 | 0.12 | 1 | 0.19 | 12.50 |
| Total | 6882.0 | 100.00 | 528 | 100.00 |
C1: 15–20.6w, C2: 21–27.9w, C3: 28–32.6w, C4: 33–37.6w
