Fig. 6From: Effect of doxofylline on pulmonary inflammatory response and oxidative stress during mechanical ventilation in rats with COPDComparison of MDA and SOD levels in the pulmonary tissue among the different groups of rats (n = 12, \(\overline{X}\) ± s). Note: Compared with group C, aP < 0.05; compared with group N, bP < 0.05Back to article page