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Table 1 A description of the study population (n = 2150)

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

Characteristic Number Percent
Gender
 Male 1027 47.8
 Female 1121 52.2
Grade
 9th grade 738 34.3
 10th grade 561 26.1
 11th grade 459 21.3
 12th grade 392 18.2
Type of high school
 Normal high school 558 26.0
 Anatolian high school 494 23.0
 Industrial vocational high school 489 22.7
 Trade vocational high school 285 13.3
 Girls’ technical high school 212 9.9
 Private high school 76 3.5
 Science high school 36 1.7
Monthly income per capita (n = 1539)
 Below the starvation line (<137 USD) 467 30.3
 Between the starvation and poverty lines (137–347 USD) 742 48.2
 Above the poverty line (>347 USD) 330 21.4
Mother’s education
 Primary school or less (≤5 years) 1025 47.9
 Middle or high school (6–12 years) 788 36.8
 University 328 15.3
Father’s education
 Primary school or less (≤5 years) 659 30.8
 Middle or high school (6–12 years) 1015 47.4
 University 466 21.8
Presence of a base station nearby
 No, none nearby 392 18.7
 Yes, close to home 303 14.5
 Yes, close to school 150 7.2
 Yes, close to both home and school 79 3.8
 Does not know 1171 55.9
Distance to base station (n = 924)
 None nearby or >300 m 496 53.7
  ≤ 300 m 428 46.3
School building RF quartiles
 1st quartile (≤0.602 V/m) 657 30.6
 2nd quartile (0.603–0.850 V/m) 521 24.2
 3rd quartile (0.851–1.51 V/m) 438 20.4
 4th quartile (≥1.52 V/m) 534 24.8