close to significancep = 0.064
A significant association was observed between maternal vitamin B12 levels in the highest quintile (≥81th percentile) and offspring childhood autism (aOR 1.59, 95% CI 1.06–2.41, p = 0.026) and the association was close to significance in the lowest quintile (aOR 1.49, 95% CI 0.98–2.26, p = 0.064), relative to the third quintile ( Figure 1 ).