a nonsignificant trendP=0.067
A reduced logistic regression with only vitamin B12 and ferritin (EPV=7.5) found that vitamin B12 remained significantly associated with psychosocial impairment (OR=0.983; 95% CI: 0.971-0.995; P=0.006), while ferritin showed a nonsignificant trend (OR=0.972; 95% CI: 0.943-1.002; P=0.067).