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Table 2 Comparison of Queens Census Tracts without Segments (n=597) and With NCS Segments (n=43): Mean, Inter-Quartile Range(IQR), and IQR Ratio 1

From: Use of community-level data in the National Children’s Study to establish the representativeness of segment selection in the Queens Vanguard Site

  Without Segments With Segments  
a. Demographic Characteristics Mean IQR Mean IQR IQR Ratio 2
 1) Total population 3446 2493 3919 3313 1.33
 2) Population Density 1.36 1.06 1.54 0.73 0.69
 3) Number of Households 1212 870 1350 1252 1.44
 4) % Population <18 24 8 24 7 0.88
 5) % Population >64 13 7 12 3 0.43
 6) % Female* 52 4 51 3 0.75
 7) Race     3313  
 a) % White only 43 48 40 32 0.67
 b) % Black only 24 35 22 24 0.69
 c)% Asian-Pacific Islander only** 16 21 22 25 1.19
 d) % other only 11 15 11 11 0.73
 e) % two or more races listed** 6 5 5 4 0.80
 8) Ethnicity      
 a) % Hispanic 22 23 22 17 0.74
 b) % foreign born 43 25 46 28 1.12
 c) % linguistically isolated 15 16 17 21 1.31
b. Socio-economics      
 1) % with at least a High School degree 74 14 75 11 0.79
 2) % with Bachelor’s degree or higher 23 15 24 12 0.8
 3) Per Capita Income 19675 7885 19155 5581 0.71
 4) Median Household Income 46011 16603 45261 16798 1.01
 5) % Below Poverty Level 14 11 14 10 0.91
 6) Unemployment Rate 8 5 7 5 1.00
c. Households      
 1) Average Household Size 2.94 0.7 2.9 0.58 0.83
 2) Total Housing Units 1265 891 1412 1290 1.45
 3)% Households Renting 51 40 56 45 1.13
d. Birth-Related:% of Births…      
 1) to Women <17* 2 2 2 2 1.00
 2) to Women with < 12 Years Education. 20 14 18 12 .86
 3) to Primiparous Women 35 8 36 8 1.00
 4) to Women with little or no prenatal care 9 6 9 5 0.83
 5) to Women on Medicaid 50 22 55 22 1.00
 6) Low Birth Weight** 9 5 8 2 0.40
 7) Pre-Term 13 5 12 6 1.2
e. Transit Related      
 1) % Commuters Using Cars 47 24 45 23 0.96
 2) % Commuters Using Public Transport 45 21 46 19 0.90
 3) Subway Stop Density 0.49 0 0.32 0 -
 4) Bus Stop Density 27 20 25 26 1.30
 5) Distance to central business district 1 (km) 11 5 11 6 1.20
 6) Distance to central business district 2 (km) 10 6 10 8 1.33
 7) Street length weighted average speed limit 27 3 27 3 1.00
f. Playground and Greenery      
 1) Street Trees per km2 1100 752 1040 491 0.65
 2) Number of Playgrounds 0.36 1 0.44 1 1.00
g. Safety and Social Disorder      
 1) Pedestrians Injured in Car Accidents 3 4 3 5 1.25
 2) Bicyclists Injured in Car Accidents*, 3 0.71 1 1.19 2 2.00
 3) Annual Crime Complaints per capita 0.016 0.004 0.016 0.005 1.25
h. Land Use      
 1) % of Building Space – Residential 87 12 84 13 1.08
 2) % of Building Space – Commercial 13 12 16 13 1.08
 3) % Lot Area Zoned Commercial 12 14 11 14 1.00
 4) Land Use Mix 34 35 29 30 .85
 5) Number of Buildings 513 298 489 232 0.78
 6) Mean Floors Per Building 2.2 0.4 2.5 0.2 0.50
 7) Walk-ability −1 4 −1 3 0.75
i. Pollution Sources      
 1)% of Tract within 805m of a TRI Site 29 67 31 69 1.03
 2) % of Tract within 402m of Point Source** 4 0 1 0 -
 3) % of tract with 300m of truck route 39 40 37 51 1.28
 4) % of tract covered by any of the above 54 67 53 55 0.82
  1. *p<0.05 by Mann Whitney U **p<0.05 by t-test.
  2. 1 A full description of each indicator, including the data source, is provided in Table 1. Except for indicators with small values, results are rounded for display purposes to the nearest whole number; original values (with decimals) were used for purposes of statistical testing.
  3. 2 Inter-quartile range ratio: the ratio of the inter-quartile range (segmented tracts divided by non-segmented tracts); a value greater than 1 indicates more variability in segmented tracts than in non-segmented; a value less than 1 indicates more variability in non-segmented tracts.