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Table 5 Odds ratio (OR) and 95 % confidence interval (CI) for brain tumours [4,5].

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

> 1 year latency > 5 years latency > 10 years latency
Score Ca/Co OR 95 % CI Score Ca/Co OR 95 % CI Score Ca/Co OR 95 % CI
Total 716/713 1.1 0.9 – 1.3 Total 321/272 1.3 1.1 – 1.6 Total 69/51 1.6 1.1 – 2.3
≤ 11.0 350/357 1.0 0.9 – 1.3 ≤ 46.8 167/136 1.3 1.04 – 1.7 ≤ 166 29/26 1.2 0.7 – 2.1
> 11.0 366/356 1.1 0.9 – 1.3 > 46.8 154/136 1.3 0.98 – 1.7 > 166 40/25 1.9 1.1 – 3.3
  1. Score by multiplying weighting factors, analogue= 1, digital = 0.1, cordless telephone = 0.01, with cumulative use in hours for the different phone types and adding all three categories was used. Unconditional logistic regression analysis adjusted for age, gender and socioeconomic index was used. Unexposed groups were used for comparison. Median score among the controls for each latency period used as cut-off. Number of cases (Ca) and controls (Co) is given.