RR of thyroid cancer, and 95% CIs, according to radiation dose to the thyroid.

The curve is the equation: Relative risk = (1 + [4.75 × thyroid dose]) × (exp [−0.54 × sqrt (thyroid dose)]). Both observed and fitted RRs were adjusted for age in years for first cancer, sex, country of treatment (United Kingdom/France), surgical or radiological (>20 Gy to the spleen) splenectomy, radiation dose to the pituitary gland, nitrosourea administration, and attained age.