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  Indian J Med Microbiol
 

Figure 1: Comparison of recovery rate between morphine and codeine at different pH values. Data were presented as mean ± standard deviation for a given pH value. Differences between morphine and codeine were compared using an independent t-test. * P < 0.05, ** P < 0.01, *** P < 0.001, indicated a significant difference between groups

Figure 1: Comparison of recovery rate between morphine and codeine at different pH values. Data were presented as mean ± standard deviation for a given pH value. Differences between morphine and codeine were compared using an independent <i>t</i>-test. * <i>P</i> < 0.05, ** <i>P</i> < 0.01, *** <i>P</i> < 0.001, indicated a significant difference between groups