Definition: Percentage of infants born at low birthweight (less than 2,500 grams or about 5 lbs, 8 oz), by age of mother. For example, in 2013, about 20% of California babies born to mothers age 45 or older were at low birthweight.
Data Source: California Dept. of Public Health, Center for Health Statistics, Birth Statistical Master Files; Centers for Disease Control & Prevention, Natality data on CDC WONDER; Martin et al. (2015), Births: Final Data for 2013. National Vital Statistics Reports, 64(1) (Mar. 2015).
Footnote: The county-level data reflect the mother's county of residence, not the county in which the birth occurred. LNE (Low Number Event) refers to data that have been suppressed because there were fewer than 20 low-birthweight births in a given age group. N/A means that data are not available. Data exclude infants for whom birth weight information is missing.