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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