Fig. 1

The dose-response relationship between platelets changing and the cumulative radiation dose. We recorded the changes of platelets in a the whole population, b male, c not less than 40 years old, d less than 10 years of service, e smoking habits, f radiation technician, g second medical level, h over 10 years of service, and i nurses occupations. The solid and dashed lines are β values and corresponding 95% confidence intervals. β coefficients were estimated using Poisson regression