Table 1. Etiology of pneumonia in senile and non-senile group.

Variable	Senile (n = 300) No.(%)	Non-senile (n = 500) No.(%)	p
Streptococcus pneumoniae	130 (43.3)	187 (37.4)	0.21
Pneumococcal bacteremia	18 (6)	40 (21.3)	0.15
Haemophilus influenzae	9 (3)	19 (3.8)	0.36
Aspiration pneumonia	22 (7.3)	41 (8.2)	0.61
Legionella pneumophila	17 (5.7)	30 (6)	0.12
Staphylococcus aureus	1 (0.3)	2 (0.4)	0.53
Gram-negative bacilli	8 (2.7)	14 (2.8)	0.39
Pseudomonas aeruginosa	7 (2.3)	10 (2.0)	0.43
Atypical agents	6(2)	13 (2.6)	0.27
Other	5 (1.7)	11 (2.2)	0.36
No pathogen identified	95 (31.7)	175 (35)	0.12