Estimation of aerobic capacity and determination of its associated factors among male workers of industrial sector of Iran.

Introduction: The aim of this study was to estimate maximal aerobic capacity (VO2 max), to determine its associated factors among workers of industrial sector of Iran and to develop a regression equation for subjects' VO2 max.

Methods: In this study, 500 healthy male workers employed in Shiraz industries participated voluntarily. The subjects' VO2 max was assessed with the ergocycle test according to the Åstrand protocol.

A comparison of case-control and case-only designs to investigate gene-environment interactions using breast cancer data.

Background: The traditional methods of studying the gene-environment interactions need a control group. However, the selection of an appropriate control group has been associated with problems. Therefore, new methods, such as case-only design, have been created to study such interactions.