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Table 4 Laboratory results comparisons between uncomplicated and complicated SAB

From: C-reactive protein predicts complications in community-associated S. aureus bacteraemia: a cohort study

Laboratory Result

Total

Uncomplicated

Complicated

Comparisona

% [n = 158]

% [n = 51]

% [n = 107]

Crude OR

95% CI

p-value

Microbiological tests

 PSSA

18.4 [29]

17.6 [9]

18.7 [20]

1.07

(0.45, 2.56)

0.874

 MSSA

74.1 [117]

74.5 [38]

73.8 [79]

0.97

(0.45, 2.07)

0.928

 nm-MRSA

5.1 [8]

5.9 [3]

4.7 [5]

0.78

(0.18, 3.42)

0.746

    MRSA

2.5 [4]

2.0 [1]

2.8 [3]

1.44

(0.76, 14.22)

0.754

 Poly-microbial

10.8 [17]

17.6 [9]

7.5 [8]

0.38

(0.14, 1.04)

0.061

Blood tests

 C-Reactive protein concentration median (IQR)

144.0 (141.0) [139]

127.0 (129.7) [48]

160.0 (145.6) [91]

1.01

(1.00, 1.01)

0.007

 Platelet cell count median (IQR)

177.5 (138.8) [150]

190.0 (126.5) [49]

175.0 (143.5) [101]

1.00

(0.99, 1.00)

0.346

 White cell count median (IQR)

11.4 (7.8) [150]

10.0 (6.2) [49]

12.1 (9.5) [101]

1.07

(1.01, 1.13)

0.027

 Lymphocyte cell count median (IQR)

0.8 (0.8) [150]

0.8 (0.85) [49]

0.8 (0.7) [101]

0.85

(0.54, 1.33)

0.477

 Neutrophil cell count median (IQR)

9.1 (6.6) [150]

7.4 (6.2) [49]

9.8 (7.5) [101]

1.05

(0.98, 1.13)

0.146

 C-reactive protein concentration over 161 mg/L

40.3 [56]

22.9 [11]

49.5 [45]

3.29

(1.50, 7.24)

0.003

 White blood cell count over 14.85 × 109/L

30.7 [46]

16.3 [8]

37.6 [38]

3.09

(1.31, 7.29)

0.01

 Neutrophil cell count over 9.25 × 109/L

48.7 [73]

36.7 [18]

54.5 [55]

2.06

(1.02, 4.15)

0.043

  1. PSSA penicillin-sensitive S. aureus; MSSA methicillin-sensitive S. aureus; nm-MRSA non-multiple methicillin-resistant S. aureus; MRSA methicillin-resistant S. aureus; IQR interquartile range; OR odds ratio; CI Confidence interval
  2. aUnivariable logistic regression model