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Table 1 Descriptive statistics of dependent and independent variables, by gender

From: The relative influence of demographic, individual, social, and environmental factors on physical activity among boys and girls

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)
  1. *Significant gender difference at P < 0.05 assessed via chi-square and t-test
  2. sd = standard deviation; MVPA = Moderate-to-vigorous physical activity
  3. 1Physical activity equipment availability and accessibility summary score
  4. 2Distance in kilometers
  5. 3Sum of z-scores of residential, intersection, and employment density variables
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