Results of arterial blood gas tests in Group 2H (ventilated for 2 hours, 10 ml/Kg) and Group 4H (ventilated for 4 hours, 10 ml/Kg).

Values expressed as mean ± standard deviation.* p Results of arterial blood gas tests in Group 2H (ventilated for 2 hours, 10 ml/Kg) and Group 4H (ventilated for 4 hours, 10 ml/Kg).数据以均值±标准差（mean ± standard deviation）表示。* p 代表2小时通气组（Group 2H，通气时长2小时，10 ml/kg）与4小时通气组（Group 4H，通气时长4小时，10 ml/kg）的动脉血气检测结果。