Our results of a borderline significant decrease in breast cancer risk for women with high levels of occupational physical activity are consistent in the direction and magnitude of the association with several other prospective studies that have reported a 15–25% lower risk with occupational activity ( Thune et al , 1997 ; Moradi et al , 1999 ; Dirx et al , 2001 ; Rintala et al , 2002 , 2003 ; Mertens et al , 2006 ).
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