The weblog version of this message is at:
http://www.emfacts.com/weblog/index.php?p=532

From Sam Milham:

Dear Don,
I smell a rodent. There were 4 brain cancers in the workers in floors 16-17, while according to appendix table 3, 0.29 cases would have been expected. This a significant excess using a poisson test. If the benign tumors are added to the total malignant tumors, there is also a significant excess of all tumors (obs. 13, exp. 6.9 ).

Sam Milham