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Table 1 Selected characteristics of the study population, by age group: United States, 2012

From: Population-based geographic access to endocrinologists in the United States, 2012

Characteristic 0–17 years 18–64 years ≥65 years
  [N = 74,181,467] [N = 194,296,087] [N = 40,267,984]
Percentage of population urban/rural status    
 Urbanized areas 71.7 72.0 66.8
 Rural areas 18.7 18.8 22.5
 Urban clusters 9.6 9.2 10.7
Cumulative percentage of age-specific population with access to at least one endocrinologista within a given distance (miles)    
 5 24.8 58.6 55.5
 10 44.5 74.2 70.0
 15 56.3 81.0 77.0
 20 64.1 85.4 82.1
 30 73.8 91.3 89.3
 50 85.5 96.6 95.7
Percentage of population with access to at least one endocrinologista within 20-mile buffer among all age-specific persons living in a specific urban/rural area    
 Total 64.1 85.4 82.1
 Urbanized areas 82.4 98.6 98.7
 Rural areas 20.6 55.5 51.5
 Urban clusters 11.3 43.9 42.7
Ratio of covered population to an endocrinologista within a 20-mile buffer    
 Total 39,492:1 29,887:1 6,194:1
 Urbanized areas 40,234:1 24,324:1 4,721:1
 Rural areas 32,442:1 65,208:1 15,083:1
 Urban clusters 32,018:1 92,983:1 21,210:1
  1. aFor children ages 0–17 years, estimates are calculated for access to at least one of 1,203 pediatric endocrinologists. For adults, the age-specific estimates are calculated for access to at least one of the same 6,501 adult endocrinologists