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Table 4 Three multivariable logistic regression sensitivity analyses: 1) Excluding viral pathogens; 2) Cases with unknown aetiology being indicated as not atypical; and 3) Cases with unknown aetiology being indicated as atypical

From: Atypical aetiology in patients hospitalised with community-acquired pneumonia is associated with age, gender and season; a data-analysis on four Dutch cohorts

  1) Atypical vs. other (viral cases excluded) 2) Atypical vs. other and unknown 3) Atypical and unknown vs. other
Parameter OR 95 % CI OR 95 % CI OR 95 % CI
Non-respiratory season 4.2 2.58–6.72** 3.0 1.95–4.47** 2.0 1.47–2.76**
Age <60 years 2.7 1.69–4.36** 3.0 1.97–4.59** 1.0 0.75–1.35
Male gender 1.7 1.09–2.81* 1.6 1.02–2.41* 1.2 0.91–1.56
COPDa 0.2 0.11–0.48** 0.3 0.15–0.65* 0.5 0.37–0.70**
  1. Abbreviations: OR odds ratio, CI confidence interval, COPD chronic obstructive pulmonary disease
  2. *Indicates a p-value <0.05; **Indicates a p-value < 0.001
  3. aIndicates four missing values