Namely: Guys are not only significantly more likely to drink while engaging in aquatic activities. They're also more likely to drink alone, at night, and without a life jacket while engaging in aquatic activities. In addition, more men than women consider themselves excellent swimmers, even though on average they've taken fewer lessons.
The study's authors note that men are socialized towards risk differently than women, which would naturally lead to higher accident rates. It's surprising, though, to see them this much higher.