Table II.

Diagnostic performance measures of indicator tests at primary care in the diagnosis of community acquired pneumonia

Specificity >80%*	Positive LR >2.0*	High diagnostic odds ratio*
Temperature >38°C	Temperature >38°C	Cough
Pulse rate >100/min	Pulse rate >100/min	Crackles
Crackles	Respiratory rate ≥20/min	Respiratory rate ≥20/min
Reduced breath sound	Crackles	Temperature >38°C
	PCT >0.25 ng/ml and CRP >20 mg/l	Pulse rate >100/min
		Reduced breath sound
		PCT >0.25 ng/ml and CRP >20 mg/l

^*Diagnostic performances for individual factors. PCT, procalcitonin; CRP, C-reactive protein; LR, likelihood ratio

Source: Ref. 36