Table 1.
Characteristics of the patients before propensity score matching
| Under group | Control group | Standardized differencea | P value | |
|---|---|---|---|---|
| Number | 1060 | 4003 | ||
| Age (years) | 57 ± 21 | 54 ± 21 | 14% | < 0.0001 |
| Male / female | 521 / 539 | 2054 / 1949 | 0.211 | |
| Height (cm) | 155 ± 21 | 159 ± 14 | 19% | < 0.0001 |
| Weight (kg) | 55 ± 17 | 59 ± 17 | 24% | < 0.0001 |
| ASA-PS | < 0.0001 | |||
| 1 /2 | 175 / 642 | 1037 / 2176 | ||
| 3 / 4 / 5 | 231 / 12 / 0 | 737 / 51 / 2 | ||
| Type of surgery | < 0.0001 | |||
| Craniotomy | 4 | 330 | ||
| ENT | 82 | 1049 | ||
| Thoracic | 66 | 205 | ||
| Cardiovascular | 81 | 366 | ||
| Endovascular aortic repair | 72 | 49 | ||
| Abdominal (laparoscopic) | 164 | 404 | ||
| Abdominal (non-laparoscopic) | 447 | 654 | ||
| Surface of the trunk | 41 | 387 | ||
| Orthopedic | 23 | 380 | ||
| Spinal | 71 | 74 | ||
| Unclassifiable | 9 | 105 | ||
| Type of warming method | < 0.0001 | |||
| Over full cover | 37 | 1333 | ||
| Over upper cover | 124 | 1123 | ||
| Over lower cover | 237 | 1652 | ||
| Over right cover | 5 | 11 | ||
| Over left cover | 6 | 17 | ||
| Over heating cover | 20 | 263 | ||
| Duration of anesthesia (min) | 413 ± 231 | 307 ± 219 | 46% | < 0.0001 |
Data are presented as numbers or means ± S.D. a: Standardized difference for a covariate is the mean difference between the groups divided by the S.D., converted into a percentage