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Table 2 Odds ratio (OR) and 95% confidence interval (CI) for factors that might explain mobile phone access and regular use. Unconditional logistic regression analysis adjusted for age, gender and household income was used. Number of "exposed" (access or regular use) and "unexposed" (no access, no regular use) in the different categories is shown.

From: Ownership and use of wireless telephones: a population-based study of Swedish children aged 7–14 years

  Children who reported mobile phone access Children who reported regular use*
  Access/no access OR 95 % CI Regular use/no regular use OR 95 % CI
Household income**       
   Average 553/147 1.0 - 143/395 1.0 -
   <Average 125/45 0.6 0.4 – 0.9 44/78 1.5 0.98 – 2.4
   >Average 420/94 1.3 0.96 – 1.8 97/313 0.9 0.7 – 1.3
H-regions       
   H1 200/54 1.0 - 69/128 1.0 -
   H2 163/47 1.0 0.6 – 1.7 53/104 0.8 0.5 – 1.4
   H3 390/122 0.9 0.6 – 1.3 89/291 0.5 0.3 – 0.7
   H4 224/45 1.3 0.8 – 2.2 41/177 0.3 0.2 – 0.5
   H5 83/19 1.2 0.6 – 2.3 26/55 0.8 0.4 – 1.5
   H6 64/10 2.0 0.9 – 4.6 14/48 0.5 0.2 – 0.9
Siblings       
   No 83/14 1.0 - 29/53 1.0 -
   Yes 1041/283 0.4 0.2 – 0.8 263/750 0.5 0.3 – 0.8
Overweight       
   No 888/223 1.0 - 236/633 1.0 -
   Yes 156/43 1.1 0.7 – 1.7 35/115 0.9 0.6 – 1.4
Obesity       
   No 1019/254 1.0 - 268/727 1.0 -
   Yes 25/12 0.6 0.3 – 1.3 3/21 0.4 0.1 – 1.4
Spent time watching TV       
   < 30 min per day 70/30 1.0 - 10/57 1.0 -
   ≥ 30 – 60 min per day 347/132 1.2 0.7 – 2.0 78/260 2.0 0.9 – 4.2
   > 60 – 180 min per day 601/124 1.8 1.05 – 3.2 157/429 2.2 1.1 – 4.6
   > 180 min per day 97/10 2.8 1.1 – 6.9 45/51 3.6 1.6 – 8.4
Spent time playing computer games       
   Never 143/34 1.0 - 65/75 1.0 -
   < 30 min per day 422/137 1.5 0.9 – 2.5 97/313 0.6 0.4 – 0.997
   ≥ 30 – 60 min per day 298/84 1.7 0.98 – 3.0 63/231 0.6 0.4 – 1.03
   > 60 – 180 min per day 196/37 1.8 0.97 – 3.5 53/134 0.7 0.4 – 1.3
   > 180 min per day 55/1 8.0 0.999 – 64 12/42 0.4 0.2 – 0.96
Regular physical activity       
   1–7 hours per week 792/230 1.0 - 188/582 1.0 -
   8–14 hours per week 146/15 1.6 0.8 – 3.0 46/99 1.2 0.8 – 1.9
   >14 hours per week 10/4 0.2 0.1 – 0.9 6/4 4.7 1.1 – 19
Use of DECT       
   Never 136/64 1.0 - 38/92 1.0 -
   < 5 min per day 541/190 1.7 1.1 – 2.5 74/446 0.4 0.3 – 0.7
   ≥ 5 – 15 min per day 295/26 4.3 2.5 – 7.4 91/202 1.0 0.6 – 1.6
   > 15 – 30 min per day 97/6 5.2 1.9 – 14 58/39 2.8 1.5 – 5.0
   > 30 min per day 32/1 4.3 0.5 – 35 26/6 5.7 2.1 – 16
Hours of sleep       
   7–9 hours 735/119 1.0 - 230/491 1.0 -
   < 7 hours 15/2 0.5 0.1 – 3.0 10/5 3.6 1.1 – 12
   > 9 hours 371/175 0.8 0.6 – 1.1 51/305 0.6 0.4 – 0.8
Enough sleep       
   Yes 922/262 1.0 - 211/684 1.0 -
   No 185/31 0.9 0.6 – 1.5 75/108 1.5 1.1 – 2.2
  1. * = Defined as talking for ≥ 2 min per day among those who reported mobile phone access.
  2. ** = Adjusted for age and gender.
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