Remarks on probability theory and TMJ diagnosis.

Probability theory Events Two different simple events, for example, E| = 'Head" (H) and E. = 'Tail' (T), cannot oceui' at the same time — they are mutually exclusive. By eontrast, compound events ean oeeur simultaneously; for example, Ei3=2 and E2=s4 are not exelusive when the eompounil event is 3 or 3-5. Similarly, a [latient may eomplain of both temporomandibular joint (TM.I) pain and TMJ erepitus; the two eomplaints are not mutually exelusive. On the other hand, the two different simple events of either presence of TMJ pain or absence of TMJ pain are mutually exelusive. The interseetion of two events E| and E2 implies another event when Ei and Ei oeeur simultaneously: