Lake County Illinois GISBirths rates across Lake County, Illinois by ZIP Code. Explanation of field attributes: LBW - Low birth weight is defined as a birth where the baby weighs less than 2,500 grams. This is a percent. Preterm - Preterm birth is defined as a birth that occur before 37 weeks of pregnancy. This is a percent. Teen Birth - Teen births are defined as women aged 15 to 19 years who give birth. This is a rate. Birth Rate - Birth rate is defined as the number of live births per 1,000 populations. 1st Trimester of Care - 1st Trimester of care refers to the doctor's visits and care provided during the first 13 weeks of pregnancy. This is a percent.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/bd21e9c9650c46139f2058b54f8ce536_0engLake County Illinois Open Data PortalPublicBirth Statistics [Illinois--Lake County]Web servicesIllinois--Lake CountyIllinoisLast Modified: 2018-09-18