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Table 1 Descriptive characteristics and aggregate mean scores of daily minutes of physical activity and sedentary behaviors among female middle school students, IMPACT Baseline Study, 2001 (n = 718)

From: Social support, physical activity and sedentary behavior among 6th-grade girls: a cross-sectional study

Descriptor Total Sample Moderate-Vigorous PA min. Vigorous PA min. TV-video viewing min. Computer-video game playing min. Combined sedentary min.c
  n % mean SD mean SD mean SD mean SD mean SD
Total Sample 718 100 65.8 57.8 17.6 34.1 102.4 86.8 22.4 36.2 124.8 98.3
Ethnicity             
   White (non-Hispanic) 515 71.8 68.8 54.2 15.7 29.5 96.0 83.8 21.0 32.4 117.0 94.2
   Hispanic 83 11.6 75.6 63.3 22.3 36.2 127.5 87.3 18.2 40.8 145.7 95.7
   Othera 119 16.6 68.0 60.4 22.9 40.1 113.7 95.1 31.0 46.4 144.7 112.5
    p = .607   p = .042   p = .003   p = .014   p = .003  
BMI-for-age percentilesb             
   5th percentile 28 3.9 51.9 41.5 11.1 22.6 84.1 83.7 21.5 28.9 105.6 89.8
   >5th to <85th percentile 510 71.0 71.6 57.9 17.3 32.1 97.0 84.1 20.5 33.5 117.5 95.4
   85th to <95th percentile 105 14.6 67.2 53.9 17.5 29.1 105.2 79.1 22.6 41.3 127.8 89.6
   95th percentile 74 10.3 63.9 53.0 22.6 40.9 140.2 104.8 34.3 46.1 174.5 115.5
    p = .247   p = .424   p = .001   p = .025   p < .001  
  1. Abbreviations: PA, physical activity; min., minutes; SD, standard deviation,
  2. aIncludes African American (n = 39), Asian/Pacific Islander (n = 26), Native American (n = 7), and other (n = 47)
  3. bCalculations and classifications based on National Center for Health Statistics and National Center for Chronic Disease Prevention and Health Promotion growth charts, with 5th percentile = underweight; >5th to <85th percentile = normal weight; 85th to <95th percentile = at risk for overweight; and 95th percentile = overweight
  4. cCombined Sedentary Behavior is the sum of daily T.V.-video viewing minutes and daily computer-video game playing minutes