OXTR and Anxiety: The results from the multivariable linear regression analyses (Table 5, Supplementary Table S2) testing the associations among OXTR variants and severity of symptoms revealed rs237899 polymorphism was significantly associated with overall symptoms (β = 1.669; p = 0.019) and hostility symptoms (β = 0.427; p = 0.044); and rs13316193 polymorphism was significantly associated with anxiety symptoms (β = −0.197; p = 0.038).