Table 6.

Parameter estimates for stomach cancer in multiplicative excess relative risk (ERR) models and excess absolute risk (EAR) model with adjustment for smoking

	Excess relative risk (ERR)				Excess absolute risk (EAR)
		Simple Linear ERR	Linear ERR adj. for smoking	Linear model with effect modifiers, adj. for smoking		Linear model with effect modifiers, adj. for smoking
All stomach cancer, n=5,661	ERR/Gy	0.36 (0.22, 0.50)a	0.33 (0.20, 0.47)	0.33b (0.20, 0.47)	EAR/Gy	9.16 (5.14, 14.0)
	Attained age [power]	--	--	−1.93 (−2.94, −0.82)	Attained age [power]	1.75 (0.72, 2.92)
	Sex ratio [F/M]	--	--	2.20 (1.15, 4.80)	Sex ratio [F/M]	1.06 (0.50, 3.02)
	AICc	115.3	15.1	0

^a95% Confidence Interval,

^bRecommended model, stomach cancer; $\left(1+{\beta }_s\mathrm{d}\mathrm{*}\mathrm{e}\mathrm{x}\mathrm{p}\left({\delta }_1\log \left(\frac{a}{70}\right)+\varphi I\left(K>4\right)\right)\right)\left(1+{ERR}_{smk}\right)$, where $d$ is radiation dose, $I$ is an indication function, a is attained age, $K$ is total shielded kerma, and $\beta$, $\delta$ and $\varphi$ are regression coefficients.

^cAkaike Information Criterion (AIC) difference from model with lowest AIC