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Table 2 Summary of results from different census tract assignment methods (ZIP code centroids and geo-imputation).

From: Estimating the accuracy of geographical imputation

Population Cases Randoma Geographic Centroidb Population Centroidc Overall Population Distribution Population Distribution by Race/Ethnicity Population Distribution by Race/Ethnicity-Age
  N Mean % (Min, Max %) Total % Total % Mean % (Min, Max %) Mean % (Min, Max %) Mean % (Min, Max %)
All Cases 95,303 14.1 (13.5,14.7) 20.7 25.9 25.8 (25.3, 26.3) 26.7 (26.0, 27.4) 27.7 (26.5, 29.0)
Non-Hispanic White 75,577 15.0 (14.6, 15.4) 22.0 27.9 27.8 (27.4, 28.1) 28.2 (27.7, 28.7) 29.3 (28.4, 30.3)
Non-Hispanic Black 11,123 9.8 (9.0, 10.8) 15.3 16.6 16.5 (15.7, 17.4) 20.1 (18.7, 21.0) 21.3 (19.5, 23.2)
Hispanic 6,368 11.1 (10.0, 12.4) 16.3 19.2 18.8 (17.4, 20.0) 19.8 (18.7, 21.3) 20.2 (17.5, 22.7)
Asian 2,235 13.7 (11.6, 15.8) 17.3 25.4 26.0 (24.2, 28.5) 28.8 (26.4, 31.5) 28.8 (24.5, 33.5)
Age        
20–49 11,931 14.2 (13.4, 15.2) 22.0 26.5 26.5 (26.4, 27.4) 27.5 (26.4, 28.4) 27.7 (25.6, 29.5)
50–64 29,452 14.2 (13.6, 14.8) 21.1 26.4 26.2 (25.6, 26.6) 27.0 (26.2, 27.3) 27.4 (26.2, 28.6)
65–84 47,798 14.1 (13.6, 14.5) 20.3 25.4 25.6 (25.1, 26.0) 26.5 (26.1, 27.2) 27.8 (26.8, 28.8)
>85 6,122 13.9 (12.8, 15.3) 19.4 25.9 25.2 (23.9, 26.4) 25.9 (24.1, 27.4) 29.1 (26.9, 31.3)
Population Density        
<1,132 17,262 16.5 (15.9, 17.2) 29.6 29.6 30.8 (30.1, 31.2) 31.4 (30.3, 32.1) 31.8 (30.5, 33.1)
1,133–2,882 23,036 15.3 (14.9, 15.8) 24.1 29.0 30.2 (29.7, 31.0) 30.8 (30.2, 31.2) 32.4 (31.5, 33.4)
2,883–5,078 21,744 14.1 (13.4, 14.6) 19.2 27.1 25.6 (24.9, 26.2) 26.4 (26.7, 27.4) 27.8 (26.7, 28.7)
5,079–11,579 18,822 14.7 (13.9, 15.5) 17.1 26.3 24.9 (24.8, 25.3) 26.4 (25.5, 27.2) 26.8 (25.3, 28.2)
>11,579 14,439 8.6 (7.9, 9.3) 12.0 14.3 14.3 (13.6, 15.0) 15.5 (14.3, 16.2) 16.3 (14.9, 17.6)
  1. aRandom assignment was based on census tracts having equal probability within each postal ZIP code.
  2. bGeographic postal ZIP centroids were based on the center of the bounding rectangle for each ZIP code area.
  3. cPopulation weighted postal ZIP centroids were calculated as the mean of the census block centroid coordinates weighted by the number of persons per block.
  4. Source: Data from the New Jersey State Cancer Registry, New Jersey Department of Health and Senior Services, 2005.