Table 3.
The Baseline Charities of the Two Groups of Patients Before and After Matching
| Feature | Before PS Matching | After PS Matching | ||||
|---|---|---|---|---|---|---|
| NIs (n=231) | Without NIs (n=1067) | p-value | NIs (n=196) | Without NIs (n=325) | p-value | |
| Gender (male), No. (%) | 163 (70.6) | 613 (57.5) | p<0.001 | 136 (69.4) | 223 (68.6) | p=0.854 |
| Age, mean ± SD | 59.81 ± 18.02 | 57.76 ± 18.63 | p=0.128 | 59.33 ± 18.05 | 59.11 ± 17.09 | p=0.890 |
| APACHE II score, mean ± SD | 19.88 ± 9.18 | 15.02 ± 7.62 | p<0.001 | 18.96 ± 8.53 | 18.18 ±8.52 | p=0.312 |
| Malignancies, No. (%) | 22 (9.5) | 152 (14.2) | p=0.056 | 21 (10.7) | 39 (12.0) | p=0.656 |
| Disorder of consciousness, No. (%) | 73 (31.6) | 112 (10.5) | p<0.001 | 49 (25.0) | 73 (22.5) | p=0.507 |
| The surgical operation, No. (%) | 109 (47.2) | 671 (62.9) | p<0.001 | 99 (50.5) | 191 (58.8) | p=0.066 |
| Trauma, No. (%) | 108 (46.8) | 443 (41.5) | p=0.144 | 90 (45.9) | 148 (45.5) | p=0.933 |
| Shock, No. (%) | 61 (26.4) | 156 (14.6) | p<0.001 | 47 (24.0) | 76 (23.4) | p=0.877 |
| MODS, No. (%) | 21 (9.1) | 16 (1.5) | p<0.001 | 5 (2.6) | 6 (1.8) | p=0.588 |
| MV, No. (%) | 204 (88.3) | 479 (44.9) | p<0.001 | 169 (86.2) | 282 (86.8) | p=0.860 |
| CVC, No. (%) | 175 (75.8) | 554 (51.9) | p<0.001 | 142 (72.4) | 232 (71.4) | p=0.794 |
| CRRT, No. (%) | 29 (12.6) | 51 (4.8) | p<0.001 | 18 (9.2) | 19 (5.8) | p=0.151 |
Abbreviations: PS matching, Propensity score matching; SD, standard deviation; NIs, Nosocomial infections; MODS, Multiple organ dysfunction syndromes; MV, Mechanical ventilation; CVC, Central venous catheter; CRRT, Continuous renal replacement therapy.