Table 4—

Comparison of demographical data, smoking, spirometry and arterial blood gases in stable condition, steroid therapy and polycythaemia between admissions with (LspH) and without (NLspH) serological evidence of infection with Legionella spp.

VariableLspHNLspHp‐value between groups
Subjects n40200
Sex m36 (90)166 (83)ns
Mean age yrs64.6±8.667.6±8.8*
Smoking
 Pack-yrs65.3±39.357.6±30.0ns
 Current smoker18 (45)74 (37)ns
Spirometry
 Mean FEV1 L1.01±0.441.02±0.45ns
 FEV1 % of expected38.7±16.141.2±16.6ns
  FEV1>50%9 (23)53 (27)ns
  35%<FEV1≤50%11 (28)46 (23)ns
  FEV1≤35%20 (50)101 (51)ns
 FEV1/FVC0.565±0.1200.588±0.114ns
Pa,O2 mmHg63.7±13.368.4±12.8<0.04
Pa,CO2 mmHg47.8±10.544.4±10.2ns
Chronic steroid therapy
 Inhaled15 (37)48 (24)ns
 Oral14 (35)56 (28)ns
Polycythaemia (haematocrit >50%)10 (25)22 (11)<0.03
  • Data are presented as value±sd or value (%) unless otherwise stated

  • m: male

  • FEV1: forced expiratory volume in one second

  • FVC: forced vital capacity

  • Pa,O2: arterial oxygen tension

  • Pa,CO2: arterial carbon dioxide tension

  • *: p<0.05

  • ns: nonsignificant