However, when analysts refrain from such questionable practices, the A-bomb database is a uniquely powerful resource for conclusive human evidence. Another enormous scientific merit of the A-Bomb Study is the relative absence of confounding variables, which can muddy and even invalidate so many other studies. For instance, in the A-Bomb Study, all the exposed groups received a single acute dose at the same time. Such studies can provide no reliable indication of the latency period or the duration of radiation's carcinogenic effect. By contrast, the A-Bomb Study is capable of revealing, over its course, some valuable information about the duration of the carcinogenic effect, and about minimum, maximum and average latency periods.
Cancers exclude leukemia.
Column I excludes leukemia. The radiation-sensitivity of the young, not apparent here, becomes clear in Chapter 15.