Fig. 1

Three-band threshold scores applied on the SDQ results. The 3-band threshold scores, as proposed by Goodman [46] applied on the SDQ results of NSSI group and non-NSSI group for all scales. The original thresholds divided the normative population, based on a UK community sample, into a ‘normal’ group of 80%, a ‘borderline’ group of 10%, and an ‘abnormal’ group of 10%