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Table 1 Characteristics of study participants

From: Group-based physical activity trajectories in children transitioning from elementary to high school

Characteristic Total
n = 652
Males
n = 297
Females
n = 355
p-value*
Age (Mean ± SD), years 10.6 (0.5) 10.6 (0.5) 10.5 (0.5) .82
Race (%)
 Black 36.2% 39.1% 33.8% .53
 White 37.9% 35.7% 39.7%  
 Hispanic 9.2% 9.4% 9.0%  
 Other 16.7% 15.8% 17.5%  
Parent Education, % Beyond high school 57.8% 56.1% 59.9% .32
Maturity index at baseline, (Mean ± SD) −1.63 (1.11) −2.61 (0.6) −0.81 (0.7) <.001
BMI at baseline, (Mean ± SD) 21.2 (5.0) 20.7 (4.9) 21.6 (5.0) .03
Physical activity Min/hr., (Mean ± SD)
 5th, n = 652 28.3 (4.5) 29.3 (4.7) 27.5 (4.2) <.001
 6th, n = 617 24.3 (4.5) 25.9 (4.2) 23.0 (4.3) <.001
 7th, n = 616 22.7 (4.6) 24.2 (4.5) 21.4 (4.4) <.001
 9th, n = 230 19.4 (5.5) 21.3 (6.3) 19.9 (4.2) <.001
 11th,n = 207 18.9 (6.5) 21.3 (7.1) 17.2 (5.4) <.001
  1. *p-value for difference between males and females