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Table 2 Spirometrya and sputum cell counts by Chlamydia pneumoniae DNA detection status among 92 patients with chronic obstructive pulmonary disease.

From: Smoking, season, and detection of chlamydia pneumoniaeDNA in clinically stable COPD patients

  Number of Subjects Entire Study Group DNAb Present DNA Absent P-value (t-test)
Age in years (SD) 93 65.8 (10.7) 66.9 (11.9) 65.3 (10.3) 0.53
Smoking pack-years (SD) 93 43.1 (25.1) 48.9 (29.3) 41.8 (24.1) 0.22
FEV1 c (SD), L 93 1.35 (0.61) 1.34 (0.64) 1.36 (0.61) 0.88
FEV1 % predicted (SD) 93 46.9 (16.8) 44.3 (15.1) 48.0 (17.5) 0.33
FEV1/VCd % (SD) 93 45.7 (15.4) 42.6 (15.8) 47.0 (15.2) 0.22
Total cell count, 106/g (SD) 73 10.9 (15.4) 9.9 (12.5) 11.4 (16.8) 0.70
Viability, % (SD) 73 61.5 (24.2) 60.4 (22.7) 62.0 (25.0) 0.79
Squamous Epithelial, % (SD) 73 3.8 (8.6) 3.7 (5.3) 3.9 (10.0) 0.92
Neutrophils, % (SD) 73 63.6 (25.3) 60.6 (27.2) 65.2 (24.5) 0.46
Macrophages, % (SD) 73 25.6 (19.2) 26.4 (21.2) 25.2 (18.3) 0.78
Eosinophils, median % (Inter-quartile range)e 73 1.2 (3.0) 1.2 (3.7) 1.0 (2.9) 0.71e
  1. aAll spirometry after inhalation of 200 μg salbutamol. b C. pneumoniae DNA detected in peripheral blood mononuclear cells or induced sputum by nested polymerase chain reaction [14]. cFEV1: forced expiratory volume in 1 second. dVC: vital capacity. eComparison by Mann Whitney U test (SPSS).