Table 1 Baseline characteristics and details of the 650 cases of chromosomal abnormalities

Age of mother who had miscarriages (31.29 ± 4.55 years)

 ≤ 29

255

39.2

 30–34

234

36.0

 35–39

128

19.7

 ≥ 40

33

5.1

Gestational week of fetuses(9.1 ± 2.42 weeks)

 Early pregnancy(≤ 12 weeks)

597

91.8

 Middle pregnancy(13–28 weeks)

53

8.2

 Aneuploidy

259

39.9

 Autosomal trisomy

217

33.4

 Monosomy X

39

6.0

 Autosomal monosomy

3

0.45

 Sex chromosome trisomy

2

0.3

 Mosaicism

23

3.5

 Polyploidy

34

5.2

 pCNV

40

6.2

 VOUS CNV

60

9.2

 Normal

235

36.2