Is cancer risk of radiation workers larger than expected?

Table 5

Ratios of the excess relative risk per dose in low-dose-rate, moderate-dose studies and for the atomic bomb survivors as calculated in three analyses (main analysis in bold)

Endpoint	Criterion to select independent studies	Numbers of studies included*	Risk ratio, Q, best estimate and 90% CI	p Value for heterogeneity
Mortality	Larger number of cancer cases	1, 4, 5, 6, 7, 8, 9	1.21 (0.51 to 1.90)	0.79
Mortality	Smaller number of cancer cases	1, 2, 3, 5	2.08 (1.16 to 3.01)	0.21
Incidence	–	10, 11, 12	0.98 (0.41 to 1.54)	0.49