Table 5.
Comparison of clinical characteristics between the SAS value ≤ 6 and SAS value ≥ 7 patients
| SAS value ≤ 6 (N = 97) | SAS value ≥ 7 (N = 409) | p value | |
|---|---|---|---|
| Age (year) | 87 ± 6 (71–102) | 87 ± 6 (70–100) | 0.480 |
| Male | 14 (14.4) | 80 (19.6) | 0.243 |
| Body mass index | 20.2 ± 3.3 (14.2–30.8) | 20.5 ± 3.2 (13.7–32.0) | 0.596 |
| Comorbidities | |||
| Hypertension | 50 (51.5) | 233 (57.0) | 0.334 |
| Old cerebral infarction | 16 (16.5) | 47 (11.5) | 0.180 |
| Chronic heart failure | 9 (9.3) | 52 (12.7) | 0.350 |
| Diabetes mellitus | 7 (7.2) | 51 (12.5) | 0.144 |
| Chronic renal failure | 1 (1.0) | 20 (4.9) | 0.087 |
| Chronic obstructive pulmonary disease | 9 (9.3) | 11 (2.7) | < 0.001 |
| Rheumatoid arthritis | 2 (2.1) | 16 (3.9) | 0.376 |
| Old myocardial infarction | 3 (3.1) | 12 (2.9) | 0.934 |
| Insertion of cardiac pacemaker | 2 (2.1) | 7 (1.7) | 0.814 |
| Hemoglobin (g/dl) | 11.2 ± 1.9 (6.6–15.6) | 11.1 ± 1.8 (6.1–16.8) | 0.380 |
| C-reactive protein (mg/dl) | 2.8 ± 4.1 (0.0–24.3) | 2.6 ± 3.4 (0.0–22.2) | 0.740 |
| Albumin concentration (g/dl) | 3.6 ± 0.5 (2.1–4.5) | 3.5 ± 0.5 (2.3–4.6) | 0.316 |
| Sodium concentration (mEq/L) | 139 ± 4 (120–162) | 139 ± 4 (125–147) | 0.790 |
| Blood urea nitrogen/creatinine ratio | 26.1 ± 6.7 (13.3–52.9) | 26.9 ± 9.5 (7.8–83.2) | 0.937 |
| ASA classification ≥ 3 | 48 (49.4%) | 201 (49.1%) | 0.952 |
| Ejection Fraction (%) | 65 ± 9 (46–89) | 64 ± 9 (39–88) | 0.529 |
| Moderate to severe valvular disease | 15 (15.5) | 76 (18.6) | 0.472 |
| PaO2 (mmHg) | 77 ± 11 (51–98) | 75 ± 12 (45–104) | 0.275 |
| Dementia | 47 (48.4) | 197 (48.2) | 0.959 |
| Waiting period for surgery(day) | 9.1 ± 3.6(2–19) | 9.0 ± 3.3(2–20) | 0.744 |
| Preoperative fever (≥ 38°) | 23 (23.7) | 128 (31.3) | 0.142 |
| General anesthesia | 74 (76.3) | 302 (73.8) | 0.620 |
| Spinal anesthesia | 23 (23.7) | 107 (26.2) | |
| Hip hemiarthroplasty | 24 (24.7) | 77 (18.8) | 0.190 |
| Osteosynthesis | 73 (75.3) | 332 (81.6) | |
| Operation time (min) | 53 ± 30 (16–190) | 46 ± 24 (13–167) | 0.031 |
The data are given as patient’s number (%) or the mean ± standard deviation (range)
PaO2 partial pressure of oxygen in arterial blood