All but two of the 113 Therapeutic Use Exemptions granted this year in baseball were for attention deficit disorder, according to the annual report from the Joint Drug Prevention and Treatment Program's independent administrator.

Major League Baseball and the Players Association released the annual report on Tuesday.

The total number of tests conducted for the presence of performance-enhancing substances, stimulants and/or DHEA were 8,158, up from 7,929 last year. That included 7,630 in-season tests and 528 off-season tests.

There were 1,349 players who appeared in big league games this year, including the postseason. That means 8.4 percent of that number had exemptions.