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Amitai et al¹ examined neuropsychological performance in 45 university students exposed to carbon monoxide from old kerosene stoves used in their dormitories. Venous blood carboxyhemoglobin (COHb) levels measured at the end of the testing period showed that except for 4 measurements all COHb levels were below 0.06 (normal, <0.01), although the ambient air concentration of carbon monoxide ranged from 17 to 100 ppm. The scatterplot of COHb levels less than 0.06 vs carbon monoxide concentrations shows a rectangular distribution and not the expected linear relationship. The significant correlation between these 2 variables is artificially created by the 4 values of COHb above 0.06.

Previous studies established the relationship of carbon monoxide concentrations and COHb saturation. An ambient carbon monoxide concentration of 30 to 60 ppm is associated with a COHb level of 0.05 to 0.09 and a carbon monoxide concentration of 65 to 150 ppm with a COHb level of . . . [Full Text of this Article]

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