Hair pulling disorder and skin picking disorder have relatively limited associations with negative emotionality: A meta-analytic comparison across obsessive-compulsive and related disorders

The obsessive-compulsive and related disorders (OCRD) chapter in DSM-5 includes two relatively distinct groups of disorders: (1) Compulsive disorders [i.e., obsessive-compulsive disorder (OCD), body dysmorphic disorder (BDD), hoarding disorder (HD)] and (2) grooming disorders [i.e., skin picking disorder (SPD) and hair pulling disorder (HPD)]. The two groups may relate differently with negative emotionality; however, the literature has produced mixed findings. The current study sought to quantify the concurrent association between negative emotionality and each of the five OCRDs. We conducted systematic reviews of research reporting correlations between (1) negative emotionality (i.e., depression, anxiety, stress, negative affect, and neuroticism) and (2) severity of OCRD symptoms in both clinical and non-clinical adult samples. We used three-level meta-analytic models to estimate the size of the correlations. Negative emotionality had robust positive correlation with symptoms of OCD [k = 156, r = 0.44, 95% CI= 0.43–0.46], BDD [k = 58, r = 0.45, 95% CI= 0.43–48], and HD [k = 67, r = 0.39, 95% CI= 0.36–0.42] but significantly smaller correlation with SPD [k = 31, r = 0.31, 95% CI= 0.27–0.34] and HPD [k = 24, r = 0.28, 95% CI= 0.25–0.32]. Overall, the results indicate that grooming disorders have relatively limited associations with negative emotionality. Implications for classification of OCRDs within the broader taxonomy of psychopathology are discussed.