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Table 4 Associations of computer and cell phone use with BMI at 17 y

From: Are computer and cell phone use associated with body mass index and overweight? A population study among twin adolescents

   Mean BMI (SD) Linear regression, adjusted for gender, physical exercise, and parents' education
    Beta coefficient, 95% confidence interval p-value
Computer at home No 21.3 (2.9) - -
  Yes    
     without Internet 21.6 (3.0) 0.57 (0.15 to 0.98) 0.007
     with Internet 21.3 (3.1) 0.23 (-0.09 to 0.56) 0.16
Weekly computer use for school, work, and recreation (hours) 0–1 21.1 (3.0) - -
  >1–3 21.2 (2.9) 0.10 (-0.21 to 0.41) 0.52
  >3–6 21.3 (2.9) 0.12 (-0.20 to 0.44) 0.46
  >6–12 21.6 (3.0) 0.31 (-0.0.38 to 0.65) 0.081
  >12–115 21.7 (3.4) 0.25 (-0.14 to 0.65) 0.21
Cell phone bill (continuous) - 0.18 (0.06 to 0.30) 0.003
Cell phone bill in a month (euros) No cell phone 21.0 (3.4) -0.53 (-1.09 to 0.04) 0.068
  < 10 21.3 (3.6) -0.20 (-0.60 to 0.21) 0.34
  10 – 20 21.3 (2.9) -0.25 (-0.49 to -0.006) 0.045
  20 – 35 21.4 (2.9) - -
  35 – 85 21.7 (2.9) 0.29 (-0.04 to 0.63) 0.085