TF and autism: Further meta-analysis combining the causal estimates of PGC and FinnGen Consortium also showed that there was no association between serum iron (OR = 0.99, 95% CI: 0.72–1.37, p = 0.951), ferritin (OR = 0.88, 95% CI: 0.47–1.64, p = 0.676) as well as transferrin saturation (OR = 0.89, 95% CI: 0.72–1.09, p = 0.252) and autism.