1. E. L. Saenger, G. E. Thoma, E. A. Tompkins, J. Amer. Med. Assoc. 205, 855 (1968).
2. Based in part on unpublished data on the age-composition of each group supplied by Saenger et al. and unpublished tabulations of acute leukemia deaths (under rubric 204.3) in the United States supplied by the National Center for Health Statistics.
3. Saenger et al. (1) only attempted a comparison of the leukemia experience of the RAI group with that of the SUR group after adjusting for age by the so-called direct method. This method lacks the power to detect even large differences between the two groups, since the number of deaths from acute leukemia, especially in the SUR group, is too small to calculate meaningful age-and sex-specific rates.
4. R. Doll, Br. J. Radiol. 35, 31 (1962).
5. A. Stewart and G. W. Kneale, Lancet 1970-I, 1185 (1970);