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Table 1 Distribution of chromosomal abnormalities according to NT within the study population (n = 362)

From: Enlarged NT (≥3.5 mm) in the first trimester – not all chromosome aberrations can be detected by NIPT

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 %)