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Table 1 Description of study population

From: Multiple time scales in modeling the incidence of infections acquired in intensive care units

General Frequency (%)
Number of admissions 84843
Number of admission-days 693180
Number of ICUs 81
Number of MRSA infections during ICU stay 469
Number of deaths without MRSA infections during ICU stay 11131
Number of discharges without MRSA infections from ICU 72701
Number of administrative censored admissions 542
Overall risk of MRSA infections (censored excluded) 0.56 %
Overall rate of MRSA infections 0.068 %
Calendar year of admission  
2006 (reference) 11301 (13.32)
2007 14862 (17.52)
2008 17654 (20.81)
2009 19361 (22.82)
2010+ 21665 (25.54)
Parient level covariates  
APACHE II score 0-10 (reference) 30291 (35.70)
APACHE II score 11-20 35428 (41.76)
APACHE II score 21-30 15187 (17.90)
APACHE II score >30 3937 (4.64)
Age (years) 0-40 42232 (49.78)
Age (years) 40-60 10227 (12.05)
Age (years) 61-80 (reference) 22989 (27.10)
Age (years)>80 9395 (11.07)
Days in hospital before ICU admission:  
0-3 (reference) 67301 (79.32)
4-6 4616 (5.44)
6-10 3950 (4.66)
>10 8976 (10.58)
Type of diagnosis:  
Cardiovascular (reference) 41990 (49.49)
Respiratory 11816 (13.93)
Gastrointestinal 10958 (12.92)
Central nervous system 14473 (17.06)
Other diagnoses 5606 (6.61)
Antibiotic treatment 48 h before and/or after ICU admission 18052 (21.28)
Gender (male) 55308 (65.19)
Origin: community (reference) 41640 (49.08)
Origin: hospital/ICU 43203 (50.92)
Trauma 7167 (8.45)