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Chiu's score in each group. CG = control group; SG = sham group; EG1 = exposure group with peritoneal air exposure for 1 h; EG2 = exposure group with peritoneal air exposure for 2 h; EG3 = exposure group with peritoneal air exposure for 3 h. Values are expressed as mean ± SD. *P = 0.000, compared with EG1.
