NT in mm | Number of cases in the cohort (%) | Number of cases with chromosome aberrations (% within the category) |
---|---|---|
3.5–4.4 | 179 (49 %) | 35 (19 %) |
4.5–5.4 | 68 (19 %) | 32 (47 %) |
5.5–6.4 | 42 (11.6 %) | 30 (71 %) |
6.5–7.4 | 24 (6.6 %) | 14 (58.3 %) |
7.5–8.4 | 14 (3.9 %) | 6 (43 %) |
≥8.5 | 10 (2.8 %) | 6 (60 %) |
unknown (hygroma colli, where NT measurement was not specified) | 25 (7 %) | 14 (56 %) |
Total | 362 | 137 (38 %) |