In this model (adjusted R2 = 0.22) FEP remained a significant predictor of elevated CCL22 (β = 245.3, p = 0.0019), while also smoking (β = 308.0, p = 0.0004), olanzapine use (β = 209.7, p = 0.036) and obesity (β = 303.2, p = 0.0042) were associated with CCL22 levels. Here, CCL22 is linked to obesity due to melanocortin 4 receptor deficiency.