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Table 6 Logistic regression of a case control study of mastitis.

From: A case-control study of mastitis: nasal carriage of Staphylococcus aureus

  Univariate analysis Multivariate analysis Model 1 (n = 192) Multivariate analysis Model 2 (n = 192) (No demographic variables)
  Odds Ratio (95% CI) Odds Ratio (95% CI) P Odds Ratio (95% CI) P
Income            
<Aus$70,000 Reference    Reference     - - - -
>Aus$70,001 0.37 0.20 0.68 0.31 0.13 0.71 0.006 - - - -
Missing 0.67 0.22 2.06 0.28 0.06 1.14 0.120 - - - -
PHI            
No Reference    Reference     - - - -
Yes 0.27 0.14 0.51 0.23 0.10 0.55 0.001 - - - -
Difficulty breastfeeding            
No Reference    Reference     Reference    
Yes 7.76 3.86 15.58 6.32 2.53 15.76 0.000 4.64 2.11 10.22 0.001
Cracked nipple            
No Reference    Reference     Reference    
Yes 15.02 5.60 40.33 9.34 2.99 29.20 0.000 9.39 3.24 27.21 0.000
Tight bra            
No v    Reference     Reference    
Yes 2.31 1.21 4.41 3.47 1.30 9.22 0.013 2.38 1.06 5.36 0.036
Baby nasal S. aureus            
No Reference    Reference     Reference    
Yes 3.70 1.85 7.40 3.23 1.30 8.27 0.017 2.70 1.19 6.14 0.018
Missing 4.56 1.41 14.71 3.49 0.78 15.50 0.101 3.20 0.83 12.38 0.092
  1. (n = 98 women with mastitis and 94 breastfeeding controls). Melbourne, Australia, 2002–2004. Model 1 includes income, private health insurance, difficulty with breastfeeding, damaged nipple, tight bra, baby nasal S. aureus, and Model 2 includes difficulty with breastfeeding, damaged nipple, tight bra and baby nasal S. aureus.