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Table 3 Regression analysis of radiation-associated absolute and relative 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

Model number Linear term for absolute risk (α) model (/1000 Scored cells /Gy) Linear term for relative risk (α) (/Gy) Exponential term (β) (/Gy) Deviance (df) p-value
  AIC-minimizing background model (no dose term)
1 - - - 106.04 (75)  
  Absolute risk model in dose (1), background adjusted using AIC-minimizing model
2 3.03 (−0.78a, 7.65) -   102.56 (74) 0.1170b
3 0.71 (−3.05a, 16.40) - 2.51 (−5.36, 11.05a) 102.10 (73) 0.5710c
  Relative risk model in dose (2), background adjusted using AIC-minimizing model
4 - 1.19 (−0.49, 3.93) - 103.60 (74) 0.1902b
5 - 0.14 (−0.97a, 7.98) 4.27 (−8.36a, 16.89a) 102.67 (73) 0.4205d
  1. All p-values relate improvement in fit evaluated via an F-test. All models adjust for background variables that minimize Akaike Information Criterion (AIC), as in Appendix 1 Table 7. 2-sided p-values and confidence intervals are adjusted for overdispersion
  2. aWald-based CI
  3. b p-value of improvement in fit over null model in dose (model number 1)
  4. c p-value of improvement in fit over linear model in dose (model number 2)
  5. d p-value of improvement in fit over linear model in dose (model number 4)