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Table 4 S. aureus results of a case control study of mastitis.

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

  Cases (N = 100)
n (%)
Controls (N = 99)
n (%)
Odds Ratio 95% CI Significance*
Mother       
Nasal swab positive for S. aureus 42/98 (43) 45/98 (46) 0.88 0.50 1.55 p = 0.666
Sparse 23 15     
Moderate 10 21     
Profuse 8 8     p = 0.0614
Expressed breast milk positive for S. aureus 45/99 (46) 15/86 (17) 3.94 1.99 7.81 **p = 0.000
Sparse 17 11     
Moderate 14 3     
Profuse 14 1     **p = 0.0339
Baby       
Nasal swab positive for S. aureus 72/88 (82) 52/93 (56) 3.55 1.80 7.00 **p = 0.000
Sparse 9 6     
Moderate 15 20     
Profuse 47 26     p = 0.1053
  1. (n = 100 women with mastitis and 99 breastfeeding controls). Melbourne, Australia, 2002–2004.
  2. *chi-square test for all analyses.
  3. **statistically significant.