Prospective study of physical activity and risk of squamous cell carcinoma of the skin.

Our observation of a suggestive positive association for recreational activity in men corroborates the finding from a large Danish prospective study [ 16 ] showing a highly significant positive association of leisure activity with keratinocyte cancers in most active men, but not in women.

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Regarding occupational activity, affected females tended to have a higher proportion of manual activity and lower proportion of sedentary occupations than nonaffected, but this difference did not reach statistical significance.

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