Clinical features

• dementia ^a
• immunosuppression ^a  

Why?

Dementia and immunosuppression increase the risk of pneumonia

Patient a	Target Disorder and Reference Standard	Diagnostic Test	LR+ (95% CI)	Post-test Probability	LR- (95% CI)	Post-test Probability
suspected pneumonia (pre-test probability: 5%)	pneumonia (chest X-ray)	history of dementia	3.4	15%	0.94	5%
		history of immunosuppression	2.2	10%	0.85	4%