Figure 3.

Vitamin B12 status according to the combined indicator of vitamin B12 status (cB12) scoring system. The cB12 score was calculated according to Fedosov et al. [9]. Proportion (95% confidence interval) of main clinical, laboratory and radiological findings in patients exposed to nitrous oxide (N₂O). Low hemoglobin status was defined according to WHO guidelines (<13.0 g/dL in men; <12.0 g/dL in nonpregnant women) [12]. Low hematocrit status was defined according to WHO guidelines (<39% in men; <36% in nonpregnant women) [12].