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Table 1 Prevalence rate of different factors or characters

From: Prevalence of birth defects and risk-factor analysis from a population-based survey in Inner Mongolia, China

Factors Delivery Cases Prevalence rate(1/10000)
Ethnicity    
Han Chinese 43503 678 155.9(144.1-167.6)
Mongolian 17051 252 147.8(129.6-166.0)
Other 1975 31 157.0(106.9-222.0)
Living areas    
Urbana 26649 332 124.6(111.1-138.1)
Rural 35895 644 179.4(165.5-193.3)
Time of pregnancy    
1 46186 574 124.3(114.6-134.8)
2 14426 280 194.1(172.9-218.0)
3 1774 91 513.0(420.1-626.1)
Maternal age(years)    
<25 27761 444 159.9(145.8-175.4)
25-- 21098 306 145.0(129.8-162.0)
30-- 9658 128 132.5(111.6-157.4)
35-- 4009 80 199.6(160.8-247.8)