Percentage of athletes who were never, intermittently, or persistently colonized with S. aureus by type of sport. Those who were staphylococcal carriers during ≥80% of the times at which they are sampled were classified as persistent carriers; those who were never colonized were non-carriers, and those colonized at least once, but <80% of the times at which they were swabbed, were classified as intermittent carriers.