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  Indian J Med Microbiol
 

Figure 2: Comparison of mean end-tidal carbon dioxide (EtCO2) between patients in melatonin and placebo groups Note: Data are expressed as the mean ± SD, and analyzed by independent t-test. Melatonin group: administered 3 mg of melatonin at 50 minutes before surgery; placebo group: administered 3 mL of distilled water at 50 minutes before surgery.

Figure 2: Comparison of mean end-tidal carbon dioxide (EtCO<sub>2</sub>) between patients in melatonin and placebo groups
Note: Data are expressed as the mean ± SD, and analyzed by independent <i>t</i>-test. Melatonin group: administered 3 mg of melatonin at 50 minutes before surgery; placebo group: administered 3 mL of distilled water at 50 minutes before surgery.