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| Variables | Control | Low-dose codeine | High-dose codeine |
|---|---|---|---|
| MDA (nmol/ml) | 5.04 ± 0.14a | 7.08 ± −0.13b | 8.15 ± 0.17c |
| MPO (U/mg) | 54.52 ± 1.34a | 77.12 ± 2.39b | 86.25 ± 1.79c |
| SOD (U/mg) | 825.43 ± 4.31a | 786.43 ± 2.43b | 740.29 ± 3.40c |
| GPx (U/mg) | 420.00 ± 3.10a | 369.86 ± 6.86b | 320.10 ± 4.34c |
Same parameter carrying different alphabets (a,b,c) are statistically different at P < 0.05.
