Impact of positive chest X-ray findings and blood cultures on adverse outcomes following hospitalized pneumococcal lower respiratory tract infection: a population-based cohort study

Table 4 Length of stay, risk of ICU admission and pulmonary complications according to LRTI manifestation group

	No infiltrate and no bacteraemia patients			Infiltrate without bacteraemia patients			Bacteraemia patients
	n (%) ^a	Crude RR ^b	Adjusted RR ^c	n (%) ^a	Crude RR ^b	Adjusted RR ^c	n (%) ^a	Crude RR ^b	Adjusted RR ^c
LOS (days)	5 (2–9)	1.0 (ref.)	1.0 (ref.)	6 (4–16)	1.6 (1.3-2.0)	1.5 (1.2-1.9)	8 (4–19)	2.0 (1.6-2.4)	2.1 (1.7-2.6)
ICU admission	14 (7)	1.0 (ref.)	1.0 (ref.)	51 (20)	2.8 (1.6-5.0)	2.4 (1.4-4.1)	60 (23)	3.2 (1.8-5.5)	3.1 (1.8-5.5)
Pulmonary complications ^d	2 (1)	1.0 (ref.)	1.0 (ref.)	12 (5)	4.6 (1.0-20.5)	4.6 (1.0-21.4)	36 (14)	13.3 (3.2-54.5)	12.6 (2.9-53.8)

LRTI, lower respiratory tract infection; RR, relative risk; LOS, length of stay; ICU, intensive care unit; ref, reference.
^a Data are median (interquartile range) or n (% of all in the manifestation group).
^b The crude measures are median ratios (95% CI) or prevalence proportion ratios (95% CI).
^c The multiple adjusted relative risks are computed using linear regression for LOS, and Poisson regression for ICU admission and pulmonary complications. The estimates are adjusted for age, sex, smoking, alcohol, and comorbidity.
^d Pulmonary complications include pleural effusion, pleural drainage, empyema, and lung abscess.
Data available for over 99%.

ISSN: 1471-2334