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Table 3 Chromosomal abnormalities according to maternal ages

From: Chromosomal abnormalities: subgroup analysis by maternal age and perinatal features in zhejiang province of China, 2011–2015

Maternal age (years) No. of births No. of abnormal cases (per 10,000 births) T21 T18 T13 Sex-related Structural abnormality
<20 37,539 3(0.80) 3(0.80) 0 0 0 0
21 ~ 24 296,130 98(3.31) 87(2.94) 5(0.17) 0 5(0.17) 1(0.03)
25 ~ 29 553,822 209(3.78) 174(3.14) 19(0.34) 1(0.02) 12(0.22) 3(0.11)
30 ~ 34 268,036 214(7.98) 179(6.68) 13(0.49) 3(0.11) 15(0.56) 4(0.15)
35 ~ 47 114,824 287(24.99) 246(21.42) 16(1.39) 3(0.26) 16(1.39) 6(0.52)
Total 1,270,351 811(6.38) 689(5.42) 53(0.42) 7(0.06) 48(0.38) 14(0.11)