Samples were selected by PPS and single random method. The authors conducted a cross-sectional survey in 6.600 pregnant women from 15 to 49 years old, in 30 villages from 18 communes and townships of Phu Cat (Binh Dinh ) - in 1/2012. The results showed that there are 9.58 percent of spontaneous abortion The proportion of spontaneous abortion increases with the 3rd pregnancy; the proportion of spontaneous abortion was 5.53 percent at the 3rd pregnancy 7/89 percent at the 4th pregnancy (OR3-4 = 7; 95 percent CI: 4 - 12.3). The proportion of spontaneous, abortion in women with passive smoking is 4.2 percent; in women without passive smoking was 2.81 percent (p 0.05). The proportion of spontaneous abortion in women exposed to pesticides was 4.68 percent; in women without exposure was 3.14 percent (p 0.05).
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