Table 2 Univariate analysis of postoperative pneumonia
| Â | Statistics | OR (95% CI) | P-value |
|---|---|---|---|
Age (years) | 77.54 ± 8.73 | 1.08 (1.05, 1.10) | < 0.0001 |
Sex (n, %) | Â | Â | Â |
 Male | 389 (26.94%) | 1.0 |  |
 Female | 1055 (73.06%) | 0.63 (0.40, 0.98) | 0.0398 |
BMI (kg/m2) | 22.02 ± 3.25 | 0.97 (0.91, 1.04) | 0.3815 |
Classification of fracture (n, %) | Â | Â | Â |
Intertrochanteric fracture | 925 (64.06%) | 1.0 | Â |
 Femoral neck fracture | 519 (35.94%) | 1.24 (0.80, 1.91) | 0.3334 |
 Time from fracture to surgery (hours) | 125.38 ± 262.26 | 1.00 (1.00, 1.00) | 0.5260 |
Comorbidity | 1042 (72.16%) | 2.03 (1.15, 3.58) | 0.0143 |
Smoking status (n, %) | 67 (4.64%) | 1.80 (0.80, 4.05) | 0.1583 |
COPD (n, %) | 29 (2.01%) | 2.44 (0.83, 7.17) | 0.1043 |
Asthma (n, %) | 21 (1.45%) | 0.74 (0.10, 5.58) | 0.7707 |
Hypertension (n, %) | 694 (48.06%) | 1.28 (0.84, 1.96) | 0.2548 |
Coronary heart disease (n, %) | 190 (13.16%) | 2.10 (1.26, 3.51) | 0.0046 |
Atrial fibrillation (n, %) | 70 (4.85%) | 1.71 (0.76, 3.84) | 0.1968 |
Stroke (n, %) | 257 (17.80%) | 2.31 (1.45, 3.67) | 0.0004 |
Parkinson’s disease (n, %) | 33 (2.29%) | 2.75 (1.04, 7.30) | 0.0422 |
Diabetes mellitus (n, %) | 326 (22.58%) | 1.25 (0.77, 2.02) | 0.3716 |
WBC count (× 10^9/L) | 9.20 ± 3.04 | 1.10 (1.03, 1.16) | 0.0034 |
Lymphocyte count (× 10^9/L) | 1.29 ± 0.59 | 0.68 (0.44, 1.05) | 0.0816 |
Neutrophil count (× 10^9/L) | 7.25 ± 3.41 | 1.06 (1.01, 1.11) | 0.0178 |
Monocyte count (× 10^9/L) | 0.59 ± 0.31 | 1.07 (0.56, 2.04) | 0.8456 |
MLR | 0.53 ± 0.41 | 1.47 (1.04, 2.09) | 0.0309 |
NLR | 6.94 ± 5.76 | 1.04 (1.01, 1.07) | 0.0037 |
Platelet count (× 10^9/L) | 208.06 ± 76.44 | 1.00 (1.00, 1.00) | 0.8809 |
Hemoglobin (g/L) | 116.54 ± 18.79 | 0.98 (0.97, 0.99) | < 0.0001 |
Albumin (g/L) | 38.06 ± 4.44 | 0.92 (0.88, 0.96) | < 0.0001 |
Globulin (g/L) | 28.48 ± 7.25 | 1.02 (1.00, 1.04) | 0.0503 |
AGR | 1.38 ± 0.28 | 0.11 (0.05, 0.26) | < 0.0001 |
Serum creatinine (umol/L) | 81.17 ± 82.19 | 1.00 (1.00, 1.00) | 0.0174 |
Blood urea nitrogen (mmol/L) | 5.60 ± 3.75 | 1.06 (1.01, 1.10) | 0.0092 |
Operation method (n, %) | Â | Â | Â |
 Internal fixation | 599 (41.48%) | 1.0 |  |
 Hip replacement | 845 (58.52%) | 1.33 (0.85, 2.07) | 0.2077 |
Anesthesia method (n, %) | Â | Â | Â |
 General anesthesia | 1100 (76.18%) | 1.0 |  |
 Non-general anesthesia | 344 (23.82%) | 1.02 (0.62, 1.68) | 0.9349 |
ASA classification (n, %) | Â | Â | Â |
 ≤ 2 | 624 (43.21%) | 1.0 |  |
 ≥ 3 | 820 (56.79%) | 2.10 (1.31, 3.36) | 0.0021 |
Operation duration (min) | 84.97 ± 35.81 | 0.99 (0.99, 1.00) | 0.1428 |
Intraoperative blood loss (mL) | 246.46 ± 195.38 | 1.00 (1.00, 1.00) | 0.0170 |
In-hospital death (n, %) | 5 (0.35%) | 3.75 (0.41, 33.88) | 0.2396 |
ICU admission (n, %) | 31 (2.15%) | 14.29 (6.79, 30.06) | < 0.0001 |
Length of hospital stay (days) | 12.12 ± 6.91 | 1.09 (1. 07, 1.12) | < 0.0001 |