Validity Extensive information is available on the validity of the BDI. In terms of content validity, the BDI covers six of the nine DSM-III criteria directly, two partially (it omits increases in appetite and sleep), and omits agitation (7, p294). The 1996 BDI-II has been found to correlate 0.93 with the earlier version; kappa agreement was 0.70 (9, p85).