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Table 1 Comparison of all IPC MRSA cases to IPC-ProvLab matched data

From: The molecular epidemiology of incident methicillin-resistant Staphylococcus aureus cases among hospitalized patients in Alberta, Canada: a retrospective cohort study

April 2011 – March 2013 n(%) All IPC MRSA data IPC-ProvLab matched data p value*
n = 4818 n = 2211
  Clinical n = 1569 (32.7) Screening n = 3249 (67.4) Clinical n = 1393 (63.0) Screening n = 818 (37.0) < 0.05
Gender      0.25
 Male 825 (52.6) 1699 (52.3) 724 (52.0) 446 (54.5)
Age (Years)      < 0.05
 Mean Age (±SD) 57 (25.4) 66 (22.8) 56 (25.1) 63 (22.6)
 Median Age (IQR) 61 (18.1) 73 (11.4) 59 (18.2) 67 (14.9)
Case Classification      
 Hospital Acquired 645 (41.1) 1077 (33.1) 578 (41.5) 192 (23.5) < 0.01**
 Healthcare 326 (20.8) 978 (30.1) 277 (19.9) 276 (33.7) < 0.04**
Associated      
 Community Acquired 598 (38.1) 1194 (36.7) 538 (38.6) 350 (42.8) < 0.01**
Facility Bed Size      
 >500 681 (43.4) 1847 (56.8) 621 (44.6) 460 (56.2) 0.75
 251–500 285 (18.2) 495 (15.2) 245 (17.6) 144 (17.6) 0.1
 100–250 233 (14.9) 334 (10.3) 210 (15.1) 87 (10.6) 0.76
 <100 370 (23.6) 573 (17.6) 317 (22.8) 127 (15.5) 0.15
Severity      
 Infected 1432 (91.3) n/a 1274 (91.5) n/a 0.86
Clinical Culture Site      
 Blood 142 (9.1) n/a 130 (9.3) n/a 0.79
 Other Sterile 89 (5.7)   88 (6.3)   0.45
 Skin/Soft Tissue 947 (60.4)   830 (59.6)   0.67
 Infected Device 35 (2.2)   29 (2.1)   0.78
 Respiratory 193 (12.3)   172 (12.3)   0.97
 Urine 163 (10.4)   144 (10.3)   0.96
  1. All incident IPC MRSA cases can be identified from clinical and screening isolates. Matched clinical isolates from the ProvLab data repository were used as the surrogate molecular type for IPC cases identified from “screening” cultures
  2. *Tests of significance compare the “screening” populations, except for Clinical Culture site data
  3. **Bonferroni correction adjusted level of significance (α = 0.017) used to consider multiple comparisons with mutually exclusive groups