Table 10. Positive Predictive Values (PPV) of diagnostic factors for the diagnosis of causative pathogens.

Diagnostic Factors	Diagnosed Organism
	No. of Positive Samples/No. of Total Samples (% PPV)
	N.meningitidis	S. pneumoniae	H. influenzae	Other
Age<1 y	223/440 (50.7)	74/440 (16.8)	102/440 (23.2)	41/440 (9.3)
Fever≥38°C	404/652 (62.0)	93/652 (14.3)	133/652 (20.4)	22/652 (3.4)
Headache	366/496 (73.8)	65/496 (13.1)	87/496 (11.5)	8/496 (1.6)
Vomiting	435/678 (64.2)	90/678 (13.3)	137/678 (20.2)	16/678 (2.4)
Meningeal signs	525/824 (63.7)	118/824 (14.3)	167/824 (20.3)	14/824 (1.7)
Haemorrhagic rash	511/547 (93.4)	17/547 (3.1)	17/547 (3.1)	2/547 (0.4)
Seizures	85/201 (42.3)	65/201 (32.3)	39/201 (19.4)	12/201 (6.0)
Positive gram stain	451/784 (57.5)	140/784 (17.9)	173/784 (22.1)	20/784 (2.6)