"To reduce the incidence" means to decrease the number or frequency of something happening, usually referring to a problem or negative event. Full definition
Camera manufacturers offer a number of ways of reducing the incidence of false alarms, each with varying degrees of success. (techhive.com)
Researchers trying out new treatments need to make sure any effect the treatment has in reducing the incidence of heart disease is statistically significant. (newscientist.com)
Moreover, yogurt might even help reduce the incidence of allergies, asthma and food allergies. (howtoadult.com)