MAOA and major depressive disorder: Furthermore, analyses of the associations of age and sex with methylation were adjusted for several factors previously related to MAOA, including depression and anxiety disorders (Booij et al. 2015; Nilsson et al. 2018; Ziegler and Domschke 2018; Checknita et al. 2020), and impulsivity that characterizes individuals with antisocial disorders (Pavlov et al. 2012; Comai et al. 2012; Booij et al. 2015).