Comment by MarkMc

Yes, being a man gives you more chance of dying, but this study showed the increased risk of sitting even when taking this into account. Their result summary says they adjusted for factors including "sex, age, education, urban/rural residence, physical activity, body mass index, smoking status, self-rated health, and disability": http://archinte.ama-assn.org/cgi/content/abstract/172/6/494