“… 1. A few studies have used a 2-item scale ( Gabbay et al, 2013 ; Gabbay, Ely, et al, 2012 ; Gabbay, Mao, et al, 2012 ; Henderson et al, 2013 ; Loas et al, 2009 ; Yaseen et al, 2016 ), a 5-item scale ( Dunn et al, 2009 ), or do not report the number of items in the BDI-derived anhedonia scale used ( Dekeuleneer et al, 2021 ; Satterthwaite et al, 2015 ). Two studies have used a different 3-item scale that includes Items 4, 12, and 15, and not Item 21 ( Loas et al, 2018 ; Nizet et al, 2018 ).…”