Some men may be more likely to wash their hands after using the bathroom if they see a sign reminding them to do so, according to a study conducted at Michigan State University.

The researchers surveyed 252 college-age men who exited a campus bathroom where they had posted signs that read, “4 out of 5 Males Wash Their Hands,” with pictures of students wearing the university’s logo and a guide to effective hand-washing. When the men exited the bathroom, they were asked to fill out a questionnaire on the message they saw and whether they followed the guide.