TABLE 1.
Difference in recruitment–derecruitment (R/D) compared among positive end-expiratory pressure (PEEP) levels.
| x | y | Lower limit for 95% confidence intervals for the true mean | Difference between the estimated group means | Upper limit for 95% confidence intervals for the true mean | p | p < a |
| PEEP 15 | PEEP 12 | –63.63342759 | –12.08589441 | 39.46163878 | 1.000 | |
| PEEP 15 | PEEP 9 | –44.99566283 | 10.0363977 | 65.06845823 | 1.000 | |
| PEEP 15 | PEEP 6 | 26.8870127 | 89.7804502 | 152.6738877 | 0.000 | Statistically different |
| PEEP 15 | PEEP 3 | 71.15776833 | 143.8456676 | 216.5335669 | 0.000 | Statistically different |
| PEEP 15 | PEEP 0 | 6.587378642 | 153.7659574 | 300.9445363 | 0.033 | Statistically different |
| PEEP 12 | PEEP 9 | –33.43211166 | 22.1222921 | 77.67669586 | 0.985 | |
| PEEP 12 | PEEP 6 | 38.51534958 | 101.8663446 | 165.2173396 | 0.000 | Statistically different |
| PEEP 12 | PEEP 3 | 82.84739963 | 155.931562 | 229.0157244 | 0.000 | Statistically different |
| PEEP 12 | PEEP 0 | 18.47716559 | 165.8518519 | 313.2265381 | 0.015 | Statistically different |
| PEEP 9 | PEEP 6 | 13.52677319 | 79.7440525 | 145.9613318 | 0.006 | Statistically different |
| PEEP 9 | PEEP 3 | 58.22703456 | 133.8092699 | 209.3915052 | 0.000 | Statistically different |
| PEEP 9 | PEEP 0 | –4.899769989 | 143.7295597 | 292.3588895 | 0.067 | |
| PEEP 6 | PEEP 3 | –27.41932772 | 54.06521739 | 135.5497625 | 0.552 | |
| PEEP 6 | PEEP 0 | –87.73045913 | 63.98550725 | 215.7014736 | 0.974 | |
| PEEP 3 | PEEP 0 | –146.1107349 | 9.920289855 | 165.9513146 | 1.000 |
The table shows the difference of observable mean R/D among compared PEEP levels. As shown, a greater difference in PEEP level results in increased difference in R/D. Significant changes in R/D could not be shown when comparing adjacent PEEP levels. Difference between group means, lower limit for 95% confidence interval (CI) for the mean, and upper limit for 95% CI for the mean are presented.