Prediction model for pneumonia in primary care patients with an acute respiratory tract infection: role of symptoms, signs, and biomarkers

Table 3 Multivariate analysis of clinical variables and biomarkers in prediction model for pneumonia in 249 patients presenting at radiology department with acute respiratory tract infection in primary care

Diagnostic variable	Multivariable OR (95%CI)	P value
Age cohort (18–47 years is reference category)		0.54
• 48–63	1.74 (0.48–6.30)
• ≥64	0.61 (0.05–8.07)
Runny nose absent	3.12 (1.22–8.00)	0.02
Feel ill	13.33 (2.80–63.40)	0.00
Current smoker	0.27 (0.06–1.19)	0.08
Oxygen saturation	0.94 (0.72–1.24)	0.68
CRB-65 score^a (0 IS REFERENCE CATEGORY)		0.41
• 1	5.29 (0.46–61.15)
CRP > 30 mg/l	4.66 (1.73–12.55)	0.00

^aCRB-65 severity score predicting 30 day mortality with higher score implicating higher 30 day mortality. C = new onset confusion, R = respiratory rate ≥ 30/min, B = Blood pressure (Systolic < 90 mmHg or Diastolic ≤60 mmHg), 65 = Age ≥ 65
No values for CRB65 score of 2 since only 2 patients were present in that category

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