4.2.1 Changing the air blood level in artery Based on Table 3.22 and Chart 3.6, we find that the index number PaO2 of 'intervention' group is 207.5 ± 17.99 mmHg which is higher in statistic than the' opposite' group, 9.4 ± 6, 5 mmHg at the moment after the first time mobilizing alveolus 5 minutes. This is the time which has the most difference about PaO2 between the two groups.