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Table 1 Socio-demographic characteristics of mothers (N = 809)

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

Characteristics Number Percentage
Minority   5 0.62
Age <20 3 0.37
20–24 98 12.08
25–29 209 25.77
30–34 214 26.39
35–47 285 35.14
Living Area Rural 323 39.83
Urban 486 59.93
Education Some/completed primary school 89 10.97
Junior/senior high school 414 51.05
College 301 37.11
Unknown 5 0.62
Gravidity at time of participation in study 1 91 11.22
2 121 14.92
3 and more 597 73.61
Parity at time of participation n study 0 229 28.24
1 404 49.82
2 and more 176 21.70