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Table 2 Mobile phone consumption characteristics of participating students (n, %)

From: Mobile phone use, school electromagnetic field levels and related symptoms: a cross-sectional survey among 2150 high school students in Izmir

Characteristic n % among users (n = 2021) % among all (n = 2150)
Mobile phone use
 Does not use a mobile phone 129 - 6.0
 Uses a mobile phone 2021 100.0 94.0
Number of calls per day (n = 1915)
  < 1 call 498 26.0 24.4
 1–4 calls 1103 57.6 54.0
 5–9 calls 219 11.4 10.7
  ≥ 10 calls 95 5.0 4.6
Total duration of calls per day
  < 5 min 583 31.1 29.1
 5–9 min 344 18.3 17.2
 10–30 min 715 38.1 35.6
  > 30 min 234 12.5 11.7
Use of earphones during calls
 Yes, always 17 0.9 0.8
 Yes, frequently/ sometimes 346 17.5 16.4
 Yes, rarely 352 17.8 16.7
 No, never 1265 63.9 60.0
Total number of text messages per day
 No text message 59 3.1 2.9
  < 15 386 20.5 19.2
 15–74 456 24.2 22.7
 75–199 435 23.1 21.6
 200+ text messages 548 29.1 27.2
Connecting to the internet via mobile phone
 No 1768 89.2 83.8
 Yes 214 10.8 10.1
Use of promotions
 No 549 28.0 26.2
 Yes 1414 72.0 67.6
Type of tariff plan
 Prepaid 1909 95.3 88.8
 Bill 75 3.7 3.5
 Both types 20 1.0 0.9
SAR value of mobile phone (n = 1573)
  < 0.50 165 10.5 9.7
 0.50- < 0.75 697 44.3 41.0
 0.75- < 1.00 473 30.1 27.8
  ≥ 1.00 238 15.1 14.0
Status and position of mobile phone at night
 Off 303 21.8 19.9
 On, ≥1 m away 538 38.6 35.7
 On, 25-99 cm away 261 18.8 17.2
 On, 0–24 cm away 202 14.5 13.3
 On, distance not specified 88 6.3 5.9
Position of phone during daytime
 On daily clothes or belta 1114 61.6 51.8
 In their bag 295 16.3 13.7
 In the pocket of overcoat or jacket 223 12.3 10.4
 Combinations of the three above 67 3.7 3.2
 In the hand 24 1.3 1.1
 Does not carry; leaves at home or in a furniture at school 86 4.8 4.4
Status of phone while studying
 Off 159 9.2 8.5
 On/silent mode ≥ 1 m away 292 16.8 15.8
 On/silent mode < 1 m away 111 6.4 6.0
 On/silent mode on himself 1174 67.6 63.1
Charges phone in which mode
 Off 295 16.4 15.9
 On 1503 83.6 78.6
Makes calls while charging
 No 864 47.5 45.2
 Yes 954 52.5 49.3
  1. aOnly five students reported carrying on their belt