In line with this finding, our own research group found no difference in levels of IL-6 between women with PP, those at risk (because of a diagnosis of bipolar disorder, schizoaffective disorder or a history of PP) who were well in the postpartum period and healthy postpartum controls (Aas et al., 2020), supporting the idea that IL-6 does not represent a pathophysiological marker for PP. This evidence concerns the gene IL6 and schizoaffective disorder.