Margaret A.WinkerMD, Senior EditorIndividualAuthorPhil B.FontanarosaMD, Senior EditorIndividualAuthor
In Reply.—Dr Ravenholt inquires whether
smoking confounds the relationship between physical activity and mortality.
Among our cohort, 17.0% men who were sedentary at baseline died during the
follow-up period vs 10.2% of men who occasionally exercised and 5.5% of men
who were conditioning exercisers. The respective percentages for women were
7.5%, 5.0%, and 2.9%. To properly assess relationships between variables in
our entire study cohort, these data should be given by age and sex, because
both are associated with physical activity, smoking habits, and deaths, which
would result in very extensive tables. There are earlier studies on this subject
on an individual level and the results of individual-based analyses were summarized
in our article as a reference for pairwise analyses. Our article focused on
pairwise analyses among twins.
Kujala UM, Kaprio J, Sarna S, Koskenvuo M. Leisure-Time Physical Activity and Mortality: How Is Sausage Made?—Reply. JAMA. 1998;279(20):1611. doi:10-1001/pubs.JAMA-ISSN-0098-7484-279-20-jbk0527