A number of reviews have recently been conducted to examine the efficacy of MBT (Baer, 2003; Carmody & Baer, 2009; Grossman, Niemann, Schmidt, & Walach, 2004; Ledesma & Kumano, 2008; Mackenzie, Carlson, & Speca, 2005; Matchim & Armer, 2007; Ott, Norris, & Bauer-Wu, 2006; Praissman, 2008; Smith, Richardson, Hoffman, & Pilkington, 2005; Teixeira, 2008; Toneatto & Nguyen, 2007; Winbush, Gross, & Kreitzer, 2007). In fact, it could be argued that the field has become saturated with qualitative reviews on MBT. These reviews generally suggest that MBT may be beneficial to reduce stress, anxiety, and depression. However, the vast majority of these reviews are qualitative in nature and do not quantify the size of the treatment effect. In contrast, only a few reviews applied meta-analytic methods to quantify the efficacy of this treatment (Baer, 2003; Grossman, Niemann, Schmidt, & Walach, 2004; Ledesma & Kumano, 2008). 1 One of these reviews focused on MBT for stress reduction in cancer patients (Ledesma & Kumano, 2008), whereas another study examined the efficacy of mindfulness for treating distress associated with general physical or psychosomatic problems,
