Map 3: Percent of Children Screened at Least Twice by Age Three Years by County; 2002 Birth Cohort (2002 to 2005 Blood Lead Test Data), New York State Excluding New York City.

Map 3 groups counties into clusters defined by county-level percent of children screened at least twice by age three years (< 36 months). Statewide, 33.1% of children born in 2002 were screened at least twice by age three years. The map graphically depicts the variation in lead screening rates among counties across the state. County clusters were established based on the natural break statistical method, which groups county-level screening rate values into categories that optimize both the similarity of values within each category and the differences in values between categories. Counties with the highest percent of children screened at least twice by age three years are highlighted in the darkest shade of blue, while those with the lowest percent are highlighted in the lightest shade