Table 2.

Cox regression analysis of 1-year risk of mortality

		Hazard ratio (95% CI)	p value
Presence vs absence of
	Anaerobes	0·46 (0·24–0·86)	0·015
	Enterobacteriaceae	1·50 (0·56–2·36)	0·70
	Other Gram-negative	0·64 (0·34–1·19)	0·16
	Other Gram-positive	0·99 (0·51–1·93)	0·97
	Staphylococcus aureus	5·80 (2·37–14·21)	<0·0001
	Streptococcus anginosus group*	0·43 (0·19–0·97)	0·043
	Streptococcus pneumoniae	1·00 (0·39–2·56)	1·00
Dominance of
	Anaerobes	0·64 (0·29–1·42)	0·27
	Enterobacteriaceae	2·26 (1·03–4·93)	0·041
	Other Gram-negative	1·06 (0·54–2·11)	0·86
	Other Gram-positive	1·39 (0·43–4·51)	0·58
	Staphylococcus aureus	3·97 (1·20–13·08)	0·024
	Streptococcus anginosus group*	0·15 (0·02–1·10)	0·062
	Streptococcus pneumoniae	1·11 (0·39–3·12)	0·84
Hospital-acquired vs community-acquired pleural infection		3·50 (1·54–7·93)	0·0038

Hazard ratios of 1-year death (multivariate Cox regression analysis adjusted for the factors of the RAPID score) comparing the presence versus the absence of each bacterial group, the dominance of each bacterial group against the rest, and hospital-acquired versus community acquired pleural infection.

^*Consisting of S anginosus, Streptococcus intermedius, and Streptococcus constellatus.