Organism RRRa 95% CI p-value
No growth/Oropharyngeal flora (reference) (reference) (reference)
Burkholderia species 0.014 0.001 – 2.61 0.41
Corynebacterium species 1.13 0.65 – 1.96 0.82
Enterobacter species 0.92 0.48 – 1.77 0.90
Escherichia coli 0.30 0.09 – 1.05 0.34
Haemophilus influenza 2.09 1.60 – 2.73 0.006
Klebsiella pneumoniae 0.78 0.42 – 1.45 0.69
Moraxella catarrhalis 1.76 1.32 – 2.33 0.04
Pseudomonas aeruginosa 1.08 0.92 – 1.27 0.63
Serratia marcescens 1.07 0.69 – 1.68 0.88
Staphylococcus aureus 0.95 0.77 – 1.15 0.77
Stenotrophomonas maltophilia 0.92 0.54 – 1.56 0.87
Streptococcus pneumoniae 4.04 2.61 – 6.27 0.001
Streptococcus pyogenes Yeast Other organismb 1.92 0.42 0.67 1.44 – 2.64 0.14 – 1.28 0.44 – 1.04 0.03 0.43 0.36