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Table 1 Descriptive statistics of variables (n = 1722)

From: Using a social-ecological framework to examine the cognitive development of elementary school children in the U.S.

Variables

n

%

Mean

SD

Independent Variables

    

Sex

    

Boy

884

51.3

  

Girl

838

48.7

  

Race/Ethnicity

    

White, non-Hispanic

33

19.2

  

Black, non-Hispanic

881

51.2

  

Hispanic

439

25.5

  

Other

72

4.2

  

School type

    

Public school

1494

86.8

  

School with magnet programs

76

4.4

  

School of choice

147

8.5

  

Special education school

5

0.3

  

School neighborhood with crime

    

A big problem

427

24.8

  

Somewhat problem

705

40.9

  

No problem

590

34.3

  

Mother’s Educational Level

    

Less than high school

365

21.2

  

High school or equivalent

379

22

  

Some college or teaching

712

41.3

  

College or graduate

266

15.4

  

Mother’s marital status

    

Married

487

28.3

  

Separated

25

1.5

  

Divorced

6

0.3

  

Cohabiting

636

36.9

  

Romantic but not living together

432

25.1

  

Not romantic

136

7.9

  

Government Assistance

    

Yes

165

21

  

No

619

79

  

Mother’s depression

    

Yes

301

17.5

  

No

1421

82.5

  

Household income

  

44,176.55

49,471.75

Mother’s age

  

34.26

6.01

Dependent Variable

    

PPVT-III

  

92.19

18.07

WJ-AP

  

96.98

20.22

WJ-PC

  

91.57

18.58

DIGIT SPAN

  

9.26

3.02