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Table 1 Pearson correlation matrixes showing Pearson correlation coefficients (r) of resistance between pairs of antibiotics for a) E. coli , b) K. pneumonia , c) K. oxytoca , d) E. cloacae , e) P. aeruginosa

From: Antimicrobial co-resistance patterns of gram-negative bacilli isolated from bloodstream infections: a longitudinal epidemiological study from 2002–2011

a) Pearson correlation matrix (r) for E. coli

 

Cefazolin

Ceftriaxone

Ciprofloxacin

TMP-SMX

Pip-tazo

Tic-clav

Cefazolin (n = 1783)

      

Ceftriaxone (n = 1783)

0.808

     

Ciprofloxacin (n = 1783)

0.487

0.290

    

TMP-SMX (n = 1783)

0.770

0.503

0.871

   

Pip-tazo (n = 846)

0.702

0.623

0.973

0.865

  

Tic-clav (n = 1063)

0.885

0.299

0.733

0.839

nd

 

b) Pearson correlation matrix (r) for K. pneumoniae

 

Cefazolin

Ceftriaxone

Ciprofloxacin

TMP-SMX

Pip-tazo

Tic-clav

Cefazolin (n = 480)

      

Ceftriaxone (n = 480)

0.935

     

Ciprofloxacin (n = 480)

0.630

0.566

    

TMP-SMX (n = 480)

0.719

0.689

0.274

   

Pip-tazo (n = 163)

0.917

0.982

0.886

0.778

  

Tic-clav (n = 295)

0.893

0.677

0.648

0.635

nd

 

c) Pearson correlation matrix (r) for K. oxytoca

 

Cefazolin

Ceftriaxone

Ciprofloxacin

TMP-SMX

Pip-tazo

Tic-clav

Cefazolin (n = 127)

      

Ceftriaxone (n = 127)

0.576

     

Ciprofloxacin (n = 127)

0.619

0.952

    

TMP-SMX (n = 127)

0.598

−0.005

−0.184

   

Pip-tazo (n = 71)

0.011

−0.222

−0.349

−0.174

  

Tic-clav (n = 65)

0.649

0.773

0.773

0.013

nd

 

d) Pearson correlation matrix (r) for E. cloacae

 

Ceftriaxone

Ciprofloxacin

TMP-SMX

Pip-tazo

Tic-clav

 

Ceftriaxone (n = 170)

      

Ciprofloxacin (n = 170)

0.688

     

TMP-SMX (n = 170)

0.611

0.172

    

Pip-tazo (n = 83)

0.927

0.542

0.781

   

Tic-clav (n = 96)

0.944

0.613

0.781

nd

  

e) Pearson correlation matrix (r) for P. aeruginosa

 

Ceftazidime

Ciprofloxacin

Pip-tazo

Tic-clav

  

Ceftazidime (n = 115)

      

Ciprofloxacin (n = 115)

−0.457

     

Pip-tazo (n = 60)

0.177

0.225

    

Tic-clav (n = 65)

0.888

−0.100

nd

   
  1. Number of isolates (n) included in each matrix is listed for each row. Pearson coefficients (r) which are bolded represent pairs with p values ≤ 0.05, while those that are bolded and italicized trended towards significance with p values > 0.05 ≤ 0.07. Note: TMP-SMX is trimethoprim-sulfamethoxazole, Pip-tazo is piperacillin-tazobactam, Tic-clav is ticarcillin-clavulanate; nd is not determined as isolates did not consistently have both Pip-tazo and Tic-clav susceptibilities reported.