Reference: OCD is the world’s fourth most common psychiatric disorder with a lifetime prevalence of 2–3 %
Brem, Silvia et al. “The neurobiological link between OCD and ADHD.” Attention deficit and hyperactivity disorders vol. 6,3 (2014): 175-202. doi:10.1007/s12402-014-0146-x *
“From an epidemiological point of view, OCD is the world’s fourth most common psychiatric disorder with a lifetime prevalence of 2–3 % (Flament et al. 1988; Robins et al. 1984; Zohar 1999). Delorme et al. (2005) considered the disorder to have a bimodal age distribution, with a first peak at age 11 and a second in early adulthood. Up to 50 % of all OCD cases emerge during childhood or adolescence (Flament et al. 1988; Nestadt et al. 2000). The course and outcome show high persistence rates with at least 40 % in retrospective and prospective follow-up studies in OCD (Stewart et al. 2004; Zellmann et al. 2009) whereby patients in remission with OCD often developed other psychiatric disorders and other psychiatric symptoms, exacerbated by the decrease of OCD symptoms (Stewart et al. 2004). “
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