Table 4 Comparison of oxygenation index among four groups
|  | Group C (n = 43) | Group P (n = 45) | Group D (n = 43) | Group PD (n = 44) | statistic | P value |
|---|---|---|---|---|---|---|
T0 | 460.8 ± 71.7 | 469.5 ± 85.7 | 453.3 ± 54.7 | 476.5 ± 72.8 | 1.032 | 0.382 |
T1 | 469.1 ± 73.5 | 486.3 ± 63.0 | 464.1 ± 53.5 | 487.9 ± 62.7 | 1.564 | 0.200 |
T2 | 470.3 ± 64.4 | 485.6 ± 48.3 | 468.0 ± 51.4 | 491.7 ± 36.8 | 2.602 | 0.057 |
T3 | 488.2 ± 68.8 | 483.4 ± 45.0 | 483.9 ± 60.6 | 480.1 ± 38.5 | 0.165 | 0.920 |
T4 | 298.5 ± 58.8# | 346.3 ± 79.6#b | 337.5 ± 73.3#a | 378.0 ± 74.6#bcd | 8.953 |  < 0.001 |
T5 | 328.1 ± 81.9# | 387.6 ± 95.4#b | 370.7 ± 75.6#a | 398.6 ± 79.4#b | 5.966 | 0.001 |
T6 | 346.5 ± 104.7# | 401.3 ± 71.8#b | 386.6 ± 95.8#a | 411.0 ± 82.9#b | 4.371 | 0.005 |