Table 1 Baseline characteristics before and after PSM matched
Characteristics | Before PSM | After PSM | ||||
|---|---|---|---|---|---|---|
LMR < 3.00 (n = 647) | LMR ≥ 3.00 (n = 870) | P value | LMR < 3.00 (n = 543) | LMR ≥ 3.00 (n = 543) | P value | |
Demographics | ||||||
Age, years | 71.14 (61.20–80.86) | 66.54 (56.60–78.66) | < 0.001 | 70.48 (59.99–80.26) | 72.08 (60.13–81.79) | 0.269 |
Gender, male | 415 (64.14%) | 542 (62.30%) | 0.462 | 348 (64.09%) | 346 (63.72%) | 0.899 |
Ethnicity, white | 423 (65.38%) | 584 (67.13%) | 0.476 | 354 (65.19%) | 381 (70.17%) | 0.080 |
BMI, Kg/m2 | 27.16 ± 6.19 | 27.55 ± 5.77 | 0.205 | 26.94 ± 5.96 | 27.30 ± 5.85 | 0.297 |
Comorbidities | ||||||
Hypertension | 274 (42.35%) | 434 (49.89%) | 0.004 | 246 (45.30%) | 264 (48.62%) | 0.274 |
Diabetes | 173 (26.74%) | 246 (28.28%) | 0.508 | 134 (24.68%) | 176 (32.41%) | 0.005 |
Congestive heart failure | 95 (14.68%) | 59 (6.78%) | < 0.001 | 58 (10.68%) | 56 (10.31%) | 0.843 |
Cardiac arrhythmias | 59 (9.12%) | 44 (5.06%) | 0.054 | 44 (8.10%) | 39 (7.18%) | 0.568 |
Chronic pulmonary disease | 111 (17.16%) | 104 (11.95%) | 0.004 | 84 (15.47%) | 88 (16.21%) | 0.740 |
Liver disease | 13 (2.01%) | 19 (2.18%) | 0.815 | 11 (2.03%) | 11 (2.03%) |  > 0.999 |
Renal failure | 101 (15.61%) | 92 (9.12%) | 0.004 | 70 (12.89%) | 75 (13.81%) | 0.656 |
Coagulopathy | 65 (10.05%) | 63 (7.24%) | 0.052 | 50 (9.21%) | 43 (7.92%) | 0.448 |
ECI | 0.00 (0.00–15.00) | 0.00 (0.00–11.00) | < 0.001 | 4.00 (0.00–12.00) | 3.00 (0.00–12.00) | 0.147 |
Vital signs | ||||||
HR, beats/min | 84.03 ± 15.31 | 81.06 ± 15.00 | < 0.001 | 83.91 ± 14.83 | 81.81 ± 15.66 | 0.029 |
SBP, mmHg | 113.16 ± 16.46 | 113.41 ± 15.03 | 0.758 | 113.96 ± 16.53 | 113.15 ± 15.61 | 0.400 |
DBP, mmHg | 59.41 ± 10.36 | 60.97 ± 9.68 | 0.001 | 59.83 ± 10.18 | 59.93 ± 9.73 | 0.855 |
MBP, mmHg | 77.24 ± 10.54 | 78.07 ± 9.58 | 0.111 | 77.97 ± 10.45 | 77.41 ± 9.62 | 0.338 |
RR, times/min | 19.27 ± 3.86 | 18.33 ± 3.28 | < 0.001 | 19.22 ± 3.82 | 18.64 ± 3.46 | 0.009 |
Temperature, ℃ | 36.85 ± 0.71 | 36.80 ± 0.62 | 0.127 | 36.87 ± 0.68 | 36.78 ± 0.69 | 0.030 |
SpO2, % | 97.04 ± 2.44 | 97.32 ± 2.72 | 0.039 | 97.19 ± 2.18 | 97.09 ± 3.24 | 0.541 |
Laboratory parameters | ||||||
WBC, 109/L | 13.97 ± 6.37 | 12.11 ± 5.33 | < 0.001 | 13.11 ± 5.08 | 13.30 ± 6.00 | 0.520 |
PLT, 109/L | 240.35 ± 103.55 | 226.43 ± 95.44 | 0.007 | 238.25 ± 103.67 | 230.50 ± 89.77 | 0.177 |
LMR | 1.88 (1.29–2.40) | 4.84 (3.81–6.50) | < 0.001 | 1.93 (1.36–2.44) | 4.75 (3.68–6.36) | < 0.001 |
Hb, g/dL | 11.47 ± 2.18 | 11.68 ± 2.11 | 0.059 | 11.58 ± 2.18 | 11.63 ± 2.16 | 0.692 |
HCT, % | 33.85 ± 6.34 | 34.18 ± 6.02 | 0.304 | 34.07 ± 6.33 | 34.16 ± 6.19 | 0.816 |
Glu, mg/dL | 174.64 ± 91.80 | 164.88 ± 87.53 | 0.036 | 172.76 ± 91.90 | 176.47 ± 99.44 | 0.533 |
Scr, mg/dL | 1.10 (0.90–1.70) | 0.90 (0.80–1.30) | < 0.001 | 1.00 (0.80–1.40) | 1.00 (0.80–1.40) | 0.977 |
BUN, mg/dL | 24.00 (17.00–35.00) | 17.00 (13.00–25.00) | < 0.001 | 22.00 (16.00–30.00) | 21.00 (15.00–29.00) | 0.421 |
Scoring system | ||||||
SIRS | 3.00 (2.00–4.00) | 3.00 (2.00–3.00) | < 0.001 | 3.00 (2.00–4.00) | 3.00 (2.00–4.00) | 0.035 |
SAPSII | 37.00 (28.00–48.00) | 30.00 (23.00–41.00) | < 0.001 | 35.00 (27.00–44.00) | 35.00 (26.00–47.00) | 0.465 |
SOFA | 4.00 (2.00–7.00) | 2.00 (1.00–5.00) | < 0.001 | 3.00 (2.00–6.00) | 3.00 (1.00–6.00) | 0.628 |
Treatment information | ||||||
PCI | 296 (45.75%) | 491 (56.44%) | < 0.001 | 267 (49.17%) | 287 (52.85%) | 0.225 |
CABG | 86 (13.29%) | 173 (19.89%) | 0.001 | 81 (14.92%) | 101 (18.60%) | 0.104 |