Average scores on the IDSS-G were higher among all disorder classifications (any disorder: mean = 0.87, s.d. = 0.47; depressive disorder: mean = 0.93, s.d. = 0.49; GAD: mean = 0.73, s.d. = 0.40) compared with participants classified as not having any of the SCID disorders (mean = 0.55, s.d. = 0.43). This evidence concerns the gene GAD1 and depressive disorder.