Table 1 

Baseline characteristics of study participants 

Characteristic 
Intervention Group (n = 10) 
Control Group (n = 10) 


Age, yr 

Mean ± SD 
11 ± 1 
13 ± 1 
Median [1^{st }quartile, 3^{rd }quartile] 
10.5 [10, 12] 
13 [12.25, 13.75] 
Gender, n (%) 

Females 
4 (40%) 
4 (40%) 
Use of all video games, minutes/day* 

Mean ± SD 
65 ± 55 
96 ± 88 
Median [1^{st }quartile, 3^{rd }quartile] 
48 [31, 66] 
80 [30, 104] 
Physical activity counts measured by accelerometer, counts/minute 

Mean ± SD 
490 ± 188 
490 ± 203 
Median [1^{st }quartile, 3^{rd }quartile] 
425 [400, 544] 
418 [358, 585] 
Time spent in light activity, minutes/day 

Mean ± SD 
635 ± 90 
652 ± 134 
Median [1^{st }quartile, 3^{rd }quartile] 
670 [594, 695] 
650 [522, 779] 
Time spent in moderate activity, minutes/day 

Mean ± SD 
97 ± 48 
69 ± 23 
Median [1^{st }quartile, 3^{rd }quartile] 
86 [59, 131] 
70 [52, 81] 
Time spent in vigorous activity, minutes/day 

Mean ± SD 
7 ± 8 
7 ± 7 
Median [1^{st }quartile, 3^{rd }quartile] 
6 [2, 9] 
3.4 [3, 11] 
Selfreported physical activity 

Time spent in moderate activity, minutes/day 

Mean ± SD 
94 ± 56 
64 ± 64 
Median [1^{st }quartile, 3^{rd }quartile] 
90 [65, 125] 
44 [19, 89] 
Time spent in vigorous activity, minutes/day 

Mean ± SD 
80 ± 54 
98 ± 87 
Median [1^{st }quartile, 3^{rd }quartile] 
72 [34, 118] 
49 [34, 159] 
PAQC score 

Mean ± SD 
3.2 ± 0.5 
2.7 ± 0.8 
Median [1^{st }quartile, 3^{rd }quartile] 
3.3 [3, 3.5] 
2.65 [2.2, 3] 
Waist circumference, cm 

Mean ± SD 
73 ± 10 
69 ± 11 
Median [1^{st }quartile, 3^{rd }quartile] 
74 [68, 80] 
65 [64, 70] 
BMI, kg/m^{2} 

Mean ± SD 
20.4 ± 3.6 
19.0 ± 3.6 
Median [1^{st }quartile, 3^{rd }quartile] 
20.4 [17.9, 22.2] 
18.3 [16.9, 20.3] 
Overweight, n (%)^{#} 
1 (10%) 
4 (40%) 


* Participants completed a fourday record of time spent playing electronic video games (active and inactive) ^{# }Using cutoffs by Cole et al[22] Note: Data presented in the table are raw data i.e. unadjusted 

Ni Mhurchu et al. International Journal of Behavioral Nutrition and Physical Activity 2008 5:8 doi:10.1186/1479586858 