Details of included studies.

CBT = Cognitive Behavioural Therapy, MBCT = Mindfulness-based Cognitive Therapy, MBSR = Mindfulness-based Stress reduction, PBCT = Person-based Cognitive Therapy.
HA = Health Anxiety, SAD = Social Anxiety Disorder, MDD = Major Depressive Disorder, OCD = Obsessive Compulsive Disorder, PTSD = Post-Traumatic Stress Disorder, PD = Panic Disorder, AG = Agoraphobia, GAD = Generalised Anxiety Disorder.
ADIS-IV-L = Anxiety Disorders Interview Schedule for DSM-IV-Lifetime version (Di Nardo, Brown, & Barlow, 1994), BDI-II = Beck Depression Inventories second edition (BDI–II: Beck, Steer & Brown, 1996), CIDI = Composite International Diagnostic Interview (WHO, 1997), PHQ-9 = Patient Health Questionnaire-9 for depression (PHQ-9; Kroenke, Spitzer, & Williams, 2001), HAMD = Hamilton Rating Scale for Depression (Hamilton, 1960), FFMQ = Five Facet Mindfulness Questionnaire (FFMQ: Baer et al., 2008), KIMS = Kentucky Inventory of Mindfulness (Baer et al, 2004), LSAS-SR = Liebowitz Social Anxiety Scale-Self-Report (Fresco et al., 2001), LSAS-avoidance subscale (Liebowitz, 1987), LSAS-fear subscale (Liebowitz, 1987), MAAS = Mindfulness Attention and Awareness Scale (Brown & Ryan, 2003), MASQ-AA = Mini Mood and Anxiety Symptom Questionnaire (Casillas & Clark, 2000), PSWQ = Penn State Worry Questionnaire (Meyer et al, 1990), SHAI = Short Health Anxiety Inventory (Salkovskis et al.,2002), MINI = Mini International Neuropsychiatric Interview (Sheehan et al, 1998), SCID = Structured Clinical Interview for DSM–IV–TR Axis I disorders (First, Gibbon, Spitzer, & Williams, 2002, STAI = Spielberger State Trait Anxiety Inventory (Spielberger et al,1983), SMQ = Southampton Mindfulness Questionnaire (Chadwick et al., 2008), Y-BOCS = Yale Brown Obsessive Compulsive Scale (Goodman et al, 2006).