Imported Malaria in Portugal 2000–2009: A Role for Hospital Statistics for Better Estimates and Surveillance

Table 2

Prevalence and length of stay considering predefined comorbidities, on univariate and multivariate analysis.

Variables	Prevalence	Mean LOS		Log LOS		Log LOS
	(%)	Days		Unadjusted—RR (CI)		Adjusted—RR (CI)
Female gender	587 (29%)	8.15 versus 8.07	0.875	0.985 (0.908–1.068)	0.71	0.956 (0.886–1.031)	0.242
Age > 64 (LOS); Age (log LOS)	119 (5.94)	11.2 versus 7.88	0.001	1.005 (1.003–1.007)	<0.001	1.296 (1.116–1.504)	0.001
Malaria related to pregnancy	37 (1.84)	8.41 versus 8.08	0.85	1.049 (0.797–1.381)	0.732
HIV infection	50 (2.50)	18.4 versus 7.83	<0.001	2.293 (1.813–2.898)	<0.001	1.123 (0.859–1.470)	0.395
Other infections	145 (7.24)	17.93 versus 7.32	<0.001	2.214 (1.927–2.542)	<0.001	1.853 (1.576–2.181)	<0.001
Pneumonia	78 (3.89)	18.3 versus 7.6	<0.001	2.477 (2.054–2.986)	<0.001	1.824 (1.507–2.210)	<0.001
Respiratory failure	89 (4.44)	19 versus 7.6	<0.001	2.284 (1.916–2.724)	<0.001	1.464 (1.212–1.770)	<0.001
Chronic obstructive pulmonary disease	35 (1.75)	12.66 versus 8.01	0.012	1.464 (1.104–1.941)	0.008	1.213 (0.931–1.578)	0.151
Diabetes mellitus	92 (4.60)	9.23 versus 8.04	0.304	1.293 (1.083–1.542)	0.004	1.108 (0.936–1.313)	0.232
Arterial hypertension	139 (6.94)	9.17 versus 8.01	0.226	1.184 (1.024–1.370)	0.023	1.054 (0.918–1.212)	0.457
Renal failure	90 (4.50)	16.1 versus 7.7	<0.001	1.759 (1.474–2.100)	<0.001	1.176 (0.985–1.405)	0.090
Anemia	426 (21.27)	11.8 versus 7.09	<0.001	1.592 (1.458–1.738)	<0.001	1.473 (1.353–1.603)	<0.001
Thrombocytopenia	374 (18.67)	7.37 versus 8.26	0.155	1.078 (0.02–0.170)	0.12