Fig. 1From: Association of brain-derived neurotrophic factor levels and depressive symptoms in young adults with acne vulgarisCorrelations of serum levels of BDNF with PHQ-9 score (a) and with AIS score (b) in acne vulgaris patients. The line is the regression line calculated with SPSS. Data were analyzed by Spearman’s rank correlation coefficient (r). BDNF, brain-derived neurotrophic factor; PHQ-9, 9-item Patient Health Questionnaire; and AIS, Athens Insomnia ScaleBack to article page