CXCL9 and scoliosis: Mental QoL (i.e. MSC) was related to the genes CXCL9 (β = −3.6, p = 0.001) and CXLC11 (β = −3.4, p = 0.002), after controlling for age and the presence of severe scoliosis, which were both no longer significantly related to QoL.