Figure 1. The mean COHb levels at 0, 60, 65, 90, 120, and 150 min after acute CO poisoning.

The values are means ± SDs (n = 8). ^* comparison of the COHb levels in the CO group with those in the HOS group at each time point (^* and ^** indicate P < 0.05 and P < 0.01, respectively).