Older men with low testosterone tend to fall more often than men with higher levels of the sex hormone, a new study finds.

Low levels of the hormone could impair vision, thinking processes and coordination, said a report from the Oregon Health & Sciences University in Portland. The report appears in the Archives of Internal Medicine.

The study involved 2,587 men aged 65 to 99 starting in 2000 and continuing to March of 2005. Men with the lowest testosterone levels had a 40% higher risk of falling than those with the highest levels.