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Table 2 Relative risk of various non-Chornobyl radiation-related factors on risk of micronucleus prevalence (after exclusion of 6 cancer cases)

From: Buccal mucosa micronuclei counts in relation to exposure to low dose-rate radiation from the Chornobyl nuclear accident and other medical and occupational radiation exposures

Relative risk category Relative risk (95% CI) p-value (for heterogeneity unless otherwise stated)
Work as industrial radiographer
Ever vs never + unknown 6.19 (0.90, 31.08) 0.0729
Has subject ever worked with radiation (apart from Chornobyl)
Ever vs never + unknown 1.68 (0.68, 4.03) 0.2584
Has subject ever worked with radiation in the nuclear industry (including nuclear power plant, apart from work in Chornobyl area)
Ever vs never + unknown 1.61 (0.62, 3.98) 0.3195
Has subject ever worked with radiation in the army (apart from work in Chornobyl area)
Ever vs never + unknown 0.27 (0.03, 1.14) 0.0721
Other work with potential radiation exposure
Ever vs never + unknown 1.36 (0.22, 7.29) 0.7283
Radiotherapy for other reasons other than cancer
Ever vs never + unknown 1.73 (0.19, 8.07) 0.5740
Dental X-rays
Ever vs never + unknown 2.94 (0.09, 19.65) 0.4539
per X-ray 0.97 (0.85, 1.11) 0.6917a
Chest X-rays
Ever vs never + unknown 1.33 (0.82, 2.17) 0.2505
per X-ray 0.98 (0.90, 1.03) 0.4231a
Bone X-rays
Ever vs never + unknown 0.60 (0.37, 0.96) 0.0388
per X-ray 0.92 (0.75, 1.10) 0.3845a
X-rays other than dental, chest, bone
Ever vs never + unknown 2.94 (0.09, 19.89) 0.4539
per X-ray 1.15 (0.90, 1.45) 0.2853a
  1. All p-values relate to improvement in fit of the model with the specific variable added, adjusted for the set of background variables that minimize Akaike Information Criterion (AIC) (as in Appendix 1 Table 7) (with that variable omitted if already included in the optimal background model). Heterogeneity p-values and confidence intervals are adjusted for overdispersion
  2. a p-value of trend