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

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

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)	0.6917^a
Chest X-rays
Ever vs never + unknown	1.33 (0.82, 2.17)	0.2505
per X-ray	0.98 (0.90, 1.03)	0.4231^a
Bone X-rays
Ever vs never + unknown	0.60 (0.37, 0.96)	0.0388
per X-ray	0.92 (0.75, 1.10)	0.3845^a
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)	0.2853^a

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
^a p-value of trend

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