“…For the comparison of patient groups, different types of methods were used. Twenty-one studies inves-tigated anxiety and depression symptoms in endometriosis patients without including a control group [27,33,34,36,37,[39][40][41][42]45,47,49,50,52,58,59,63,65,66,69,70,72,73]. Twenty-six studies compared endometriosis patients with a group of either healthy controls [30,32,35,38,39,46,51,55], CPP patients without endometriosis [29,48,54,60,67], infertile patients without endometriosis [61,64] or a combination of control groups [28,43,44,53,56,57,62,68,71].…”