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Incidence of VAP in elderly patients receiving MV
| Year | Number (N) | VAP, n (%) | NVAP, n (%) | χ2 | p |
|---|---|---|---|---|---|
| 2011 | 154 | 36（23.4） | 118 (76.6) | ||
| 2012 | 255 | 40（15.7） | 215 (84.3) | ||
| 2013 | 288 | 44（15.3） | 244 (84.7) | ||
| 2014 | 312 | 32（10.3） | 280 (89.7) | ||
| 2015 | 285 | 24（8.4） | 261 (91.6) | ||
| Total | 901 | 156（17.3） | 745 (82.7) | 23.634 | 0.000 |
Abbreviations: MV, mechanical ventilation; NVAP, non-ventilator-associated pneumonia ; VAP, ventilator-associated pneumonia.
