Table 1.
Characteristics of the 88 patients and procedures
| Valid N | Mean | Std.Dev | Median | Lower quartile | Upper quartile | |
|---|---|---|---|---|---|---|
| Age (years) | 88 | 68.5 | 9.5 | 68 | 63 | 75 |
| Before | 54 | 69.2 | 9.1 | 68 | 64 | 75 |
| After | 34 | 67.3 | 10.1 | 68 | 62 | 73 |
| Sex: males; females | 35;53 | |||||
| Before | 21;33 | |||||
| After | 13;21 | |||||
| Height (cm) | 86 | 165.4 | 9.9 | 165 | 158 | 172 |
| Before | 52 | 164.9 | 10.2 | 165 | 157 | 172 |
| After | 34 | 166.1 | 9.7 | 165 | 160 | 175 |
| Weight (kg) | 87 | 77.4 | 18.7 | 76 | 60 | 94 |
| Before | 53 | 77.8 | 20.8 | 77 | 60 | 95 |
| After | 34 | 76.8 | 15.2 | 76 | 67 | 84 |
| ASA: 1; 2; 3; 4 (n) | 7;56;16;0(/79 | |||||
| Before | 5;33;7;0(/45) | |||||
| After | 2;23;9;0(/34) | |||||
| Length of the surgery (min) | 85 | 136 | 76 | 120 | 90 | 180 |
| Before | 52 | 127 | 66 | 103 | 90 | 150 |
| After | 33 | 149 | 90 | 125 | 90 | 195 |
| General anesthesia | 62(/88) | |||||
| Before | 43(/54) | |||||
| After | 24(/34) | |||||
| TKP; THP; Colonic surgery | 27;31;30(/88) | |||||
| Before | 17;22;15(/54) | |||||
| After | 10;9;15(/34) | |||||
| Laparoscopic approach (n) | 29 | |||||
| Before | 14 | |||||
| After | 15 | |||||
| Tidal volume (ml) | 62 | 524 | 274 | 460 | 450 | 500 |
| Before | 39 | 559 | 338 | 500 | 450 | 525 |
| After | 23 | 464 | 70 | 450 | 400 | 475 |
| Frequency at beginning (cpm) | 63 | 14 | 2 | 14 | 12 | 14 |
| Before | 40 | 13 | 2 | 13 | 12 | 14 |
| After | 23 | 15 | 3 | 14 | 12 | 16 |
ASA American Society of Anesthesiology score, TKP Total knee prosthesis placement, THP Total hip prosthesis placement, Frequency at the beginning: refers to respiratory frequency at the beginning of the surgery, cpm cycles per minute