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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.