tokens: A total of 58 . 6 % ( n = 17 ) of patients with PD , 44 . 4 % ( n = 12 ) of patients with MDP , 12 . 0 % ( n = 3 ) of patients with MD , and 7 . 1 % ( n = 2 ) of control subjects had a panic attack after the 480 - mg caffeine challenge test ( chi ( 2 ) ( 3 ) = 16 . 22 , P = . 001 ) .