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Table 7 CT parameters in subjects according to sputum microbiology

From: Relationship of CT-quantified emphysema, small airways disease and bronchial wall dimensions with physiological, inflammatory and infective measures in COPD

  Frequency %LAA<−950 E/I MLD Pi10
Potentially Pathogenic Bacteria
 Culture positive 55 10.9 (17.2) 0.92 (0.07) 3.79 (0.12)
 Culture negative 51 15.1 (24.0) 0.90 (0.07) 3.78 (0.09)
 P value 0.260 0.152 0.146
Haemophilus influenzae
 Culture positive 31 11.5 (18.0) 0.92 (0.08) 3.79 (0.11)
 Culture negative 75 13.3 (20.0) 0.91 (0.07) 3.79 (0.10)
 P value 0.370 0.207 0.197
Moraxella catarrhalis
 Culture positive 8 12.4 (23.1) 0.93 (0.07) 3.78 (0.10)
 Culture negative 98 12.5 (20.3) 0.91 (0.07) 3.79 (0.11)
 P value 0.981 0.720 0.549
Streptococcus pneumoniae
 Culture positive 18 10.2 (9.9) 0.92 (0.05) 3.83 (0.11)
 Culture negative 88 14.3 (24.9) 0.91 (0.08) 3.79 (0.09)
 P value 0.501 0.626 0.203
Staphylococcus aureus
 Culture positive 6 13.5 (22.4) 0.91 (0.08) 3.74 (0.05)
 Culture negative 100 12.5 (20.6) 0.91 (0.07) 3.80 (0.11)
 P value 0.667 0.682 0.039*
Pseudomonas aeruginosa
 Culture positive 6 21.4 (27.5) 0.95 (0.06) 3.83 (0.16)
 Culture negative 100 12.0 (20.1) 0.91 (0.07) 3.79 (0.11)
 P value 0.367 0.034* 0.498
  1. Frequency given as number of subjects. For CT parameters, values represent medians and IQR. *P < 0.05 using Mann Whitney U test