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Table 4 Odds ratio (OR) and 95 % confidence interval (CI) for cumulative lifetime use in hours of analogue and digital cellular telephones, cordless telephones and any combination of the three phone types for malignant brain tumours [9].

From: Tumour risk associated with use of cellular telephones or cordless desktop telephones

  First tertile (h) Second tertile (h) Third tertile (h)
  Ca/Co OR 95 % CI Ca/Co OR 95 % CI Ca/Co OR 95 % CI
Malignant          
Analogue 57/109 1.4 0.97–2.0 41/89 1.1 0.7–1.7 80/99 1.9 1.3–2.7
Digital 133/283 1.3 1.03–1.7 108/246 1.1 0.9–1.5 161/247 1.5 1.1–1.9
Cordless 107/264 1.1 0.8–1.4 94/204 1.2 0.9–1.6 149/233 1.7 1.3–2.3
Total, any combination 170/405 1.2 0.9–1.5 169/377 1.2 0.9–1.5 244/390 1.5 1.2–1.9
Astrocytoma, grade I-II          
Analogue 5/109 0.9 0.3–2.4 7/89 1.4 0.6–3.5 7/99 1.3 0.5–3.3
Digital 20/283 1.6 0.9–2.9 12/246 1.0 0.5–2.0 24/247 1.6 0.8–2.9
Cordless 15/264 1.2 0.6–2.2 13/204 1.1 0.5–2.2 28/233 1.9 1.1–3.5
Total, any combination 25/405 1.4 0.8–2.4 22/377 1.1 0.6–2.0 41/390 1.7 1.04–2.9
Astrocytoma, grade III-IV          
Analogue 34/109 1.5 0.99–2.4 27/89 1.3 0.8–2.2 54/99 2.3 1.5–3.5
Digital 74/283 1.4 1.01–1.9 71/246 1.4 1.02–2.0 99/247 1.8 1.3–2.5
Cordless 65/264 1.2 0.8–1.6 50/204 1.3 0.9–1.9 90/233 2.1 1.5–2.9
Total, any combination 91/405 1.1 0.8–1.5 104/377 1.4 1.03–1.8 146/390 1.8 1.3–2.4
Other malignant          
Analogue 18/109 1.5 0.8–2.6 7/89 0.7 0.3–1.7 19/99 1.6 0.9–3.0
Digital 39/283 1.4 0.9–2.1 25/246 0.9 0.5–1.4 38/247 1.1 0.7–1.8
Cordless 27/264 1.0 0.6–1.6 31/204 1.3 0.8–2.1 31/233 1.2 0.8–1.9
Total, any combination 54/405 1.4 0.9–2.0 43/377 1.1 0.7–1.6 57/390 1.3 0.9–1.9
  1. Number of exposed cases (Ca) and controls (Co) are given. Unconditional logistic regression analysis adjusted for age, sex, socio-economic index and year of diagnosis was used. Tertiles were based on use among controls.
  2. Trend, malignant: Analogue – p = 0.11, digital – p = 0.21, cordless – p = 0.01, total – p = 0.04.
  3. Trend, astrocytoma, grade I-II: Analogue – p = 0.72, digital – p = 0.38, cordless – p = 0.16, total – p = 0.30.
  4. Trend, astrocytoma, grade III-IV: Analogue – p = 0.10, digital – p = 0.26, cordless – p = 0.01, total – p = 0.01.
  5. Trend, other malignant: Analogue – p = 0.21, digital – p = 0.23, cordless – p = 0.64, total – p = 0.50.
  6. Analogue: First tertile – 1–43 h, second tertile – >43–165 h, third tertile – >165 h
  7. Digital: First tertile – 1–30 h, second tertile – >30–149 h, third tertile – >149 h
  8. Cordless: First tertile – 1–122 h, second tertile – >122–365 h, third tertile – >365 h
  9. Total, any combination: First tertile – 1–91 h, second tertile – >91–410 h, third tertile – >410 h