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Table 9 Regression analysis of absolute and relative risk of micronucleus prevalence data in relation to radiation dose, using all samples

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 - - - 114.05 (80)  
  Absolute risk model in dose (1), background adjusted using AIC-minimizing model
2 2.90 (−1.26a, 7.66) - - 110.90 (79) 0.1379b
3 0.28 (−2.28a, 21.56) - 3.64 (−9.59a, 16.87a) 110.73 (78) 0.7310c
  Relative risk model in dose (2), background adjusted using AIC-minimizing model
4 - 0.94 (−0.66, 3.68) - 112.50 (79) 0.3003b
5 - 0.06 (−0.74a, 0.86a) 4.57 (−16.45a, 25.60a) 111.72 (78) 0.4625d
  1. All p-values relate improvement in fit evaluated via an F-test
  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)