Table 1 The demographic and clinical characteristics.
pH tertiles | Low | Middle | High | P value | P value* |
|---|---|---|---|---|---|
N | 365 | 531 | 569 | ||
Age (year) | 79.64 ± 6.74 | 79.71 ± 6.84 | 80.07 ± 6.78 | 0.554 | 0.673 |
pH value | 7.39 ± 0.02 | 7.43 ± 0.01 | 7.47 ± 0.02 | < 0.001 | < 0.001 |
Sex | 0.314 | – | |||
Male | 119 (32.60%) | 157 (29.57%) | 159 (27.94%) | ||
Female | 246 (67.40%) | 374 (70.43%) | 410 (72.06%) | ||
Injury mechanism | 0.071 | – | |||
Falling | 350 (95.89%) | 515 (96.99%) | 550 (96.66%) | ||
Accident | 15 (4.11%) | 13 (2.45%) | 12 (2.11%) | ||
Other | 0 (0.00%) | 3 (0.56%) | 7 (1.23%) | ||
Fracture classification | 0.148 | – | |||
Intertrochanteric fracture | 219 (60.00%) | 331 (62.34%) | 318 (55.89%) | ||
Femoral neck fracture | 137 (37.53%) | 194 (36.53%) | 239 (42.00%) | ||
Subtrochanteric fracture | 9 (2.47%) | 6 (1.13%) | 12 (2.11%) | ||
Hypertension | 170 (46.58%) | 253 (47.65%) | 292 (51.32%) | 0.294 | – |
Diabetes | 92 (25.21%) | 85 (16.01%) | 98 (17.22%) | 0.001 | – |
CHD | 174 (47.67%) | 255 (48.02%) | 308 (54.13%) | 0.066 | – |
Arrhythmia | 115 (31.51%) | 153 (28.81%) | 187 (32.86%) | 0.341 | – |
Hemorrhagic stroke | 3 (0.82%) | 8 (1.51%) | 11 (1.93%) | 0.395 | – |
Ischemic stroke | 106 (29.04%) | 141 (26.55%) | 204 (35.85%) | 0.003 | – |
Cancer | 5 (1.37%) | 21 (3.95%) | 11 (1.93%) | 0.027 | – |
Multiple injuries | 24 (6.58%) | 38 (7.16%) | 42 (7.38%) | 0.894 | – |
Dementia | 8 (2.19%) | 18 (3.39%) | 31 (5.45%) | 0.032 | – |
COPD | 30 (8.22%) | 29 (5.46%) | 28 (4.92%) | 0.097 | – |
Hepatitis | 8 (2.19%) | 15 (2.82%) | 22 (3.87%) | 0.322 | – |
Gastritis | 5 (1.37%) | 11 (2.07%) | 7 (1.23%) | 0.501 | – |
aCCI | 4.25 ± 1.10 | 4.14 ± 1.10 | 4.32 ± 1.09 | 0.023 | 0.029 |
Time to operation (d) | 4 (1–20) | 4 (1–34) | 4 (1–18) | 0.037 | 0.132 |
Time to admission (h) | 8 (1–5040) | 10 (1–2880) | 24 (1–1440) | 0.714 | < 0.001 |
Glomerular filtration rate (ml/min) | 71.96 ± 21.07 | 77.22 ± 18.14 | 79.96 ± 15.17 | < 0.001 | < 0.001 |
Urea (mmol/L) | 7.00 ± 3.08 | 6.83 ± 2.81 | 6.38 ± 2.41 | 0.001 | 0.003 |
Creatinine (umol/L) | 76.17 ± 36.03 | 68.83 ± 23.84 | 65.12 ± 20.41 | < 0.001 | < 0.001 |
Cystatin C (mg/L) | 0.89 ± 0.38 | 0.83 ± 0.30 | 0.80 ± 0.25 | < 0.001 | 0.021 |
Prothrombin time (s) | 12.74 ± 1.41 | 12.74 ± 1.70 | 12.85 ± 1.01 | 0.348 | 0.006 |
INR | 1.08 ± 0.24 | 1.08 ± 0.16 | 1.08 ± 0.10 | 0.721 | 0.072 |
Activated partial thromboplastin time (s) | 30.02 ± 5.32 | 29.80 ± 5.03 | 30.15 ± 4.66 | 0.501 | 0.185 |
Thrombin time (s) | 17.23 ± 3.69 | 16.93 ± 1.93 | 16.61 ± 1.30 | < 0.001 | < 0.001 |
DVT | 107 (29.32%) | 171 (32.20%) | 198 (34.80%) | 0.214 | – |
