Non-VAP subdivision | ||||
---|---|---|---|---|
Cohort | VAP (>104 CFU/mL) | Non-VAP (<104 CFU/mL or sterile) | Sub-104 CFU/mL growth | Sterile |
1 | 7/13 54% (25–81%) | 10/54 19% (9–31%) (p=0.014) | 6/23 26% (10–48%) | 4/31 13% (4–31%) (p=0.29) |
2 | 14/30 47% (28–66%) | 6/62 10% (4–20%) (p=0.0001) | 3/26 12% (2–30%) | 3/36 8% (2–22%) (p=0.69) |
Combined cohorts | 21/43 49% (33–65%) | 16/116 14% (9–25%) (p<0.0001) | 9/49 18% (9–32%) | 7/67 10% (4–20%) (p=0.28) |
The non-VAP subdivision is of patients with growth below the 104 CFU/mL cut-off and those with no detectable growth. Data are shown as raw values, percentage (95% CI by Clopper–Pearson method), p values by Fisher's exact test for comparison between VAP and non-VAP groups (column 3) and for comparison between sub-104 CFU/mL growth and sterile (column 5).
CFU, colony forming unit; VAP, ventilator-acquired pneumonia.