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Table 2 Trends in the incidence of chromosomal abnormalities among all mothers and mothers aged 35 years and older over time

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

Time General population Mothers over 35 years population RR (95% CI)
No. of births No. of abnormal cases Per 10,000 births No. of births No. of abnormal cases Per 10,000 births
2011 221,469 89 4.02 19,557 30 15.34 3.82(2.53 ~ 5.78)
2012 253,540 136 5.36 22,397 37 16.52 3.08(2.14 ~ 4.44)
2013 266,036 164 6.16 29,309 63 27.47 4.47(3.34 ~ 5.97)
2014 265,289 181 6.82 23,635 67 28.35 4.16(3.15 ~ 5.51)
2015 264,017 241 9.13 26,608 90 33.82 3.72(2.92 ~ 4.73)
Total 1,270,351 811 6.38 115,127 287 24.93 3.91(3.42 ~ 4.48)