Table 2

Results by condition

Chest painCOPDHeadacheSeizuresFluTotal
Total number recruited9152653501461171758*
Male (%)584744583852
Median age (range)50 years (1197 years)72 years (41–95 years)40 years (690 years)42 years (166 years)37 years (10 weeks–96 years)50 years (10 weeks–97 years)
Smokers (%)243332342127
Median COHb (range) smokers2.6% (0–11%)3.0% (0–13.4%)3.0% (0–33.3%)2.4% (0–8%)2.0% (0–7.7%)2.6% (0–33.3%)
Median COHb (range) non–smokers1.0% (0–6.1%)1.2% (0–8%)1.0% (0–18.1%)1.1% (0–5%)1.0% (0–22.2%)1.0% (0–22.2%)
Percentage of positive cases (95% CI)3.3% (2.2% to 4.6%)7.5% (4.7% to 11.4%)6.3% (4.0% to 9.4%)2.1% (0.4% to 5.9%)4.3% (1.4% to 9.7%)4.3% (3.4% to 5.4%)
Median COHb (range) for positive cases5.9% (2.5–11%)6.2% (2.5–13.4%)8.7% (4–33.3%)5.6% (5–8%)6.0% (5–22.2%)6.1% (2.0–33.3%)
Median COHb (range) for negative cases1.2% 0–8.3%)1.4% (0–8.3%)1.0% (0–7.8%)1.3% (0–8%)1.0% (0–7.7%)1.2% (0–8.3%)
  • *Some patients presented with more than one complaint.

  • COHb, carboxyhaemoglobin; COPD, chronic obstructive pulmonary disease.