Table 1. Clinical data of patients in the two groups.
| Clinical data | Modeling sample | Verification sample | χ2/t | P |
|---|---|---|---|---|
| Gender | 0.620 | 0.431 | ||
| Male | 448 | 311 | ||
| Female | 460 | 294 | ||
| Age, mean ± SD (years) | 59.02±16.76 | 60.42±13.77 | 1.776* | 0.076 |
| VAP | 106 | 82 | 1.179 | 0.278 |
| ICU length of stay, mean ± SD (days) | 9.04±2.37 | 8.89±2.39 | 1.203* | 0.229 |
| Tracheotomy | 139 | 115 | 3.558 | 0.059 |
| Length of ventilator use, mean ± SD (days) | 8.16±2.31 | 8.20±2.33 | 0.313* | 0.754 |
| Operation | 230 | 132 | 2.461 | 0.117 |
| Disorders of consciousness | 235 | 148 | 0.386 | 0.534 |
| Frequency of oral care, mean ± SD | 2.77±0.76 | 2.88±0.74 | 1.933* | 0.053 |
| Chronic disease | 750 | 500 | 0.001 | 0.982 |
| Subglottic secretion drainage | 527 | 321 | 0.001 | 0.982 |
| APACHE II score, mean ± SD | 13.83±4.92 | 13.99±4.96 | 0.604* | 0.546 |
| Combined antibiotics use | 670 | 447 | 0.002 | 0.967 |
| Antacids use | 518 | 359 | 0.782 | 0.377 |
*, data from the t-test. SD, standard deviation; APACHE, acute physiology and chronic health evaluation; VAP, ventilator-associated pneumonia; ICU, intensive care unit.