Table 1

Comparison of characteristics of S. aureus bacteremia across ethnic populations
Indigenous (n=536) Asian (n=318) Caucasian (n=6346) Polynesian (n=123) Other (n=216) P
Demographic traits
Age (median) 44 55 65 48 58 <0.001a
Age (mean) 40 (20) 52 (25) 61 (23) 43 (22) 51 (25) <0.001b
Sex (Male) 321 (60) 206 (65) 4179 (66) 80 (65) 144 (67) 0.09
IRSAD (mean) 4.6 (3.2) 6.9 (3.0) 6.7 (2.7) 4.7 (2.8) 6.3 (2.7) <0.001c
Acquistion <0.001d
CO 154 (29) 58 (19) 1235 (20) 23 (21) 33 (16)
CO HCA 243 (46) 104 (34) 2517 (42) 48 (43) 86 (42)
Nosocomial 131 (25) 141 (47) 2306 (38) 40 (36) 85 (42)
Risk factors
Dialysis 139 (26) 44 (14) 541 (9) 25 (20) 34 (16) <0.001
IDU 30 (6) 17 (7) 369 (8) 5 (7) 11 (8) 0.86e
Device related 162 (32) 130 (43) 2145 (36) 39 (34) 80 (39) 0.02f
Primary focus
Endocarditis 20 (4) 19 (6) 378 (6) 5 (4) 11 (5) 0.25
Bone/joint 91 (17) 40 (13) 782 (12) 21 (17) 22 (10) 0.01
SSTI 128 (24) 57 (18) 1152 (18) 27 (22) 51 (24) 0.005
Outcomes
ICU 91 (17) 43 (14) 763 (12) 19 (15) 19 (9) 0.004
Mortality 7 days 15 (3) 24 (8) 636 (10) 8 (7) 9 (4) <0.001
Mortality 30 days 37 (7) 49 (17) 1135 (19) 12 (12) 23 (12) <0.001g

Note. Data are number (%) of patients and means (standard deviations). IRSAD, Index of Relative Socio-economic Advantage or Disadvantage; CO, community-onset; HCA, healthcare-associated; IDU, intravenous drug using; SSTI, skin and soft tissue infection; ICU, intensive care unit.

a Kruskal-Wallis test; b Analysis of variance test (F=123.7, df=4); c Analysis of variance test (F=89.3, df=4); d χ2 test for 3x5 table. Missing data for Indigenous – 8, Asian – 15, Caucasian – 288, Polynesian – 12, Other – 12; e Missing data for Indigenous – 54, Asian – 75, Caucasian – 1474, Polynesian - 48, Other – 71; f Missing data for Indigenous – 23, Asian – 14, Caucasian – 370, Polynesian – 8, Other – 12; g Missing data for Indigenous – 17, Asian – 30, Caucasian – 415, Polynesian – 19, Other – 19.

Tong et al.

Tong et al. BMC Infectious Diseases 2012 12:249   doi:10.1186/1471-2334-12-249

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