SOD1 and infectious otitis media: There were no significant differences in the optical densities (213.5 ± 22.4 vs. 219.3 ± 18.7 vs. 223.5 ± 26.2) and surface areas (13.2 ± 0.8 mm2 vs. 14.8 ± 0.7 mm2 vs. 16.7 ± 0.4 mm2) of SOD of the Non-AOM, recovery, and control groups.