Depression rating scale score changes. Intent to treat sample (a) and per protocol sample (b).
Error bars are ± 1 SEM ; p - values refer to group by time interaction effects as revealed by repeated -measures ANOVAs.
Abbreviations: HDRS 17 = 17-item Hamilton Depression Rating Scale, ITT = intent to treat, MBCT = mindfulness-based cognitive therapy, NS = nonsignificant,, QIDS-C16 = 16-item Quick Inventory of Depressive Symptoms-Clinician Rated.