In the study, the data was collected from Norwegian Institute of Public Health’s study of 900, 000 first-time pregnancies registered in the Medical Birth Registry of Norway over a forty year period. Due to dehydration, loss of important electrolytes, malnutrition and weight loss, hyperemesis gravidarum could be life threatening for mother and baby if left untreated. The research team collected data from the Medical Birth Registry of Norway, which since 1967 has recorded data on all pregnancies and pregnancy complications. Data on the mother’s country of birth and education were recorded by Statistics Norway and linked to pregnancy information through the mother’s unique personal identification number. Mothers born in India and Sri Lanka had the highest prevalence of hyperemesis gravidarum, followed by those born in Africa (excluding North Africa) and Pakistan by 3. Maternal age between 20-24 years old, being married, carrying a female foetus or more than one foetus were all socio-demographic characteristics associated with a higher prevalence of hyperemesis gravidarum. read more

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