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

BMC Primary Care

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

	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

(n = 100 women with mastitis and 99 breastfeeding controls). Melbourne, Australia, 2002–2004.
*chi-square test for all analyses.
**statistically significant.

ISSN: 2731-4553