Table 5– Regression analysis of significant factors predicting the presence of potentially pathogenic microorganisms in sputum
VariableWald Chi-squaredp-valueOR point estimate (95% CI)
Sputum colour108.4<0.001
 Yellow versus white3.2 (2.3–4.2)
 Green versus white4.9 (3.6–6.8)
 Rust versus white2.3 (1.4–3.7)
Study32.7<0.001
 84 versus 240017 [6, 10]1.0 (0.8–1.3)
 100033 versus 240017 [7, 10]1.6 (1.3–2.0)
 100034# versus 240017 [10]1.1 (0.8–1.3)
 100160 versus 240017 [8, 10]1.3 (1.0–1.6)
 100243 versus 240017 [9, 10]1.4 (1.1–1.9)
Sputum aspect27.0<0.001
 Purulent versus mucoid2.0 (1.6–2.5)
 Purulent versus mucopurulent1.1 (1.0–1.2)
 Dyspnoea6.60.036
 Increased versus not increased1.27 (1.1–1.5)
Sex40.7<0.001
 Male versus female1.5 (1.3–1.8)
Fever14.80.001
 Absent versus present1.3 (1.1–1.6)
  • #: data held on file by Bayer Schering Pharma.