Nausea and vomiting in pregnancy (NVP) occurs in up to 75% of pregnant women.[2] However, some data suggest that incidence may vary between socio-economic groups. NVP is less common in rural women than in urban women.[3] Professional working white women have a decreased incidence of NVP compared to women who stay at home.[4] Women over the age of 35 years with a history of infertility also have a decreased incidence.[4]

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