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Health Indicator Report of Sex Ratio at Birth

The expected sex ratio at birth (male to female) is 105 boys born for every 100 girls. Studies have reported changes in the ratio of males to females at birth and some scientists have suggested that environmental hazards can affect how many males are born. Parents and the fetus can be exposed to different hazards referred to as endocrine disruptors. Fewer males are conceived when exposure to endocrine disruptors causes a decrease in testosterone.[1]

Data Source

Birth Certificate Database, Office of Vital Statistics and Registry, New Jersey Department of Health


The number of full term singleton males born divided by the number of full term singleton females born


Number of full term singleton males born to residents in a time period


Number of full term singleton females born to residents in a time period

How Are We Doing?

The sex ratio at birth among full term (> 37 weeks gestational age) singletons (not twins, triplets, etc.) in New Jersey has been stable, fluctuating slightly from year to year between 1.03 and 1.05.
Page Content Updated On 04/11/2018, Published on 04/11/2018
The information provided above is from the Department of Health's NJSHAD web site ( The information published on this website may be reproduced without permission. Please use the following citation: " Retrieved Tue, 17 July 2018 19:13:46 from Department of Health, New Jersey State Health Assessment Data Web site: ".

Content updated: Wed, 23 May 2018 05:01:08 EDT