TABLE 3

Patient characteristics predicting radiographic pneumonia on chest radiograph

Radiograph within 1 week
Proportion of patients with pneumoniaRisk ratio for pneumonia on radiographAdjusted risk ratio# for pneumonia on radiograph
Characteristic presentCharacteristic absentRisk ratio (95% CI)p-valueRisk ratiop-value
Age ≥60 years56/326 (17.2%)59/394 (15.0%)1.15 (0.82–1.60)0.422
Female59/352 (16.8%)56/367 (15.3%)1.10 (0.79–1.54)0.538
Received pneumovax <10 years earlier27/169 (16.0%)88/551 (16.0%)1.00 (0.67–1.49)0.999
Ever smoked68/431 (15.8%)46/277 (16.6%)0.95 (0.67–1.34)0.769
Any comorbidity60/359 (16.7%)55/361 (15.2%)1.10 (0.78–1.53)0.589
Lung comorbidity33/195 (16.9%)82/525 (15.6%)1.08 (0.75–1.57)0.670
On steroids or bronchodilators32/174 (18.4%)78/503 (15.5%)1.19 (0.82–1.72)0.371
Living in top decile deprivation area (most deprived)18/115 (15.7%)128/605 (21.2%)0.73 (0.46–1.17)0.188

#: risk ratio adjusted for those variables that were significantly associated with the outcome in the univariate model; : these columns are empty because none of the univariate analyses were significant.