Table 1

Descriptive statistics of dependent and independent variables, by gender

Variables

Total (n = 294)

Boys

(n = 149)

Girls

(n = 145)


Mean (sd) or percent


MVPA

21.4 (14.0)

24.6 (15.2)

18.2 (11.9)*

Demographic variables

Age, years

15.4 (1.7)

15.4 (1.7)

15.3 (1.7)

Race/ethnicity (% white)

93.5

93.3

93.8

Parent education (% college or more)

66.0

69.3

62.8

Free or reduced price lunch (%)

7.1

8.7

5.5

Overweight (%)

18.7

20.1

17.2

Physical maturation

3.0 (0.7)

2.7 (0.6)

3.3 (0.6)*

Individual variables

Self-efficacy

31.1 (4.5)

31.5 (4.2)

30.6 (4.8)

Enjoyment

29.9 (5.0)

30.3 (4.9)

29.4 (5.1)

Barriers

22.6 (6.4)

21.2 (5.7)

24.1 (6.7)*

Social variables

Parent support

11.3 (3.5)

11.2 (3.4)

11.4 (3.7)

Peer support

11.6 (3.9)

11.9 (3.8)

11.2 (4.1)

Parent physical activity

39.6 (49.9)

36.1 (49.5)

43.1 (50.3)

Environmental variables

Home PA equipment1

251.7 (132.1)

271.9 (149.4)

230.9 (108.3)*

Temperature, degrees Fahrenheit

32.1 (11.7)

31.9 (11.8)

32.2 (11.7)

Precipitation, inches

1.7 (1.1)

1.7 (1.1)

1.7 (1.2)

Snow, inches

6.1 (4.6)

6.1 (4.6)

6.0 (4.6)

Neighborhood safety

8.3 (2.2)

8.0 (2.1)

8.6 (2.2)*

Walking infrastructure

13.7 (3.0)

13.6 (3.1)

13.7 (2.9)

Distance to park2

3.4 (2.8)

3.4 (3.1)

3.4 (2.5)

Distance to rec center2

1.5 (1.3)

1.7 (1.6)

1.4 (1.0)

Distance to trail2

1.3 (2.8)

1.5 (3.4)

9.9 (2.1)

Distance to school attended2

6.3 (5.9)

6.1 (5.2)

6.5 (6.6)

Walkability index3

0.2 (2.4)

0.1 (2.5)

0.3 (2.4)


*Significant gender difference at P < 0.05 assessed via chi-square and t-test

sd = standard deviation; MVPA = Moderate-to-vigorous physical activity

1Physical activity equipment availability and accessibility summary score

2Distance in kilometers

3Sum of z-scores of residential, intersection, and employment density variables

Patnode et al. International Journal of Behavioral Nutrition and Physical Activity 2010 7:79   doi:10.1186/1479-5868-7-79

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