Mapping anhedonia onto reinforcement learning: a behavioural meta-analysis

Table 2 Sample characteristics: psychometric measures

Measure	N	mean	median	1st quartile	3rd quartile
BDI	366	8.3	6	1	11
BDA	281	1.9	0	1	3
BDI\A	281	6.9	1	5	10
Generalized distress depression (GDD)	276	23.2	16	20	30
Generalized distress anxiety (GDA)	276	18.8	15	18	24
Anxious anxiety (AA)	276	53.7	45	53.5	65
Anhedonic Depression (AD)	276	21.1	17	20.5	25
Full (BDI + BDA + MASQ subscores)	255

BDI is the total Beck Depression Inventory II [16]. BDA stands for the anhedonic subscore of the BDI consisting of the sum of items 4 (loss of pleasure), 12 (loss of interest), 15 (loss of energy) and 21 (interest in sex). BDI\A is the total BDI score without the anhedonic component (BDI\A = BDI - BDA). Mood and Anxiety Symptom Questionnaire (MASQ) subscores [17] were anxious arousal (AA), anhedonic depression (AD), general distress anxiety (GDA) and generalised distress depression (GDD).

ISSN: 2045-5380