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Table 3 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 benign brain tumours [8].

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
Benign          
Analogue 77/109 1.5 1.1–2.1 51/89 1.4 0.97–2.1 71/99 1.9 1.3–2.7
Digital 175/283 1.2 0.9–1.5 141/246 1.2 0.9–1.5 121/247 1.1 0.9–1.5
Cordless 146/264 1.1 0.9–1.4 108/204 1.1 0.8–1.4 169/233 1.5 1.2–1.9
Total, any combination 238/405 1.1 0.9–1.4 187/377 1.0 0.8–1.2 252/390 1.4 1.1–1.7
Meningioma          
Analogue 47/109 1.3 0.9–1.9 32/89 1.3 0.8–2.0 34/99 1.3 0.9–2.1
Digital 116/283 1.0 0.8–1.3 106/246 1.2 0.9–1.6 73/247 1.0 0.7–1.4
Cordless 106/264 1.1 0.8–1.4 70/204 0.9 0.7–1.3 118/233 1.4 1.1–1.9
Total, any combination 163/405 1.0 0.8–1.3 136/377 1.0 0.8–1.2 162/390 1.2 0.96–1.6
Acoustic neuroma          
Analogue 20/109 2.3 1.3–4.0 18/89 2.7 1.5–4.9 30/99 4.1 2.4–7.0
Digital 42/283 1.7 1.1–2.5 26/246 1.2 0.7–1.9 37/247 1.7 1.03–2.7
Cordless 27/264 1.1 0.7–1.8 29/204 1.5 0.95–2.5 40/233 1.8 1.2–2.8
Total, any combination 46/405 1.3 0.9–1.9 40/377 1.2 0.8–1.8 69/390 2.0 1.4–3.0
Other benign          
Analogue 10/109 2.5 1.2–5.5 2/89 0.5 0.1–2.1 7/99 1.7 0.7–4.2
Digital 17/283 2.1 1.1–3.9 10/246 1.2 0.5–2.6 11/247 1.0 0.4–2.1
Cordless 13/264 1.4 0.7–2.8 9/204 1.4 0.6–3.2 12/233 1.5 0.7–3.1
Total, any combination 29/405 2.1 1.2–3.5 11/377 0.8 0.4–1.7 22/390 1.5 0.8–2.7
  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, benign: Analogue – p = 0.42, digital – p = 0.97, cordless – p = 0.06, total – p = 0.02.
  3. Trend, meningioma: Analogue – p = 0.99, digital – p = 0.40, cordless – p = 0.07, total – p = 0.18.
  4. Trend, acoustic neuroma: Analogue – p = 0.17, digital – p = 0.31, cordless – p = 0.18, total – p = 0.02.
  5. Trend, other benign: Analogue – p = 0.11, digital – p = 0.16, cordless – p = 0.98, total – p = 0.047.
  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