Live births to mothers with low Body Mass Index (3-year average) in Washington

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Definitions: Percent of live births to mothers with a low Body Mass Index (BMI). Mothers’ low BMI presented here are calculated by dividing the number of live birth babies whose mothers had low BMI at the time of birth in three consecutive calendar years by the total number of live births reported in the same period.

Data Source: The data used for this measure come from Center for Health Statistics, Washington State Department of Health (DOH), Birth Data. Data were retrieved on November 26, 2019 at http://www.doh.wa.gov/DataandStatisticalReports/VitalStatisticsData/BirthData/BirthTablesbyTopic.aspx (Birth Table B6).

S: Data estimate has been suppressed. Percents are not shown when the average number of live birth babies whose mothers had low BMI over the three consecutive years is fewer than 10.

Footnotes: Data last updated in November 2019 by Washington KIDS COUNT.

BMI is calculated using the weight and the height of an individual in the following formula: BMI = (703.1 x weight in lbs)/square of height in inches. The Center for Disease Control and Prevention (CDC) classifies BMI into four categories. When the values are less than 18.5, BMI is considered low. Low BMI is also referred to as being underweight.

We combined three years of data to minimize unreliability of measurement due to small numbers. The values reported here refer to rolling averages across three years. For instance, we report the average value across the years 2003, 2004 and 2005.