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Table 1 Background characteristics of participants in 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's age (mean, years) 33.5 31.7     **p = 0.004
Mother's education:       
Completed secondary 89 (89) 90 (91) 1.24 0.49 3.13 p = 0.655
Completed tertiary degree 63 (63) 70 (71) 1.02 0.90 1.16 p = 0.779
Family income (n = 184)       
up to $50,000 20/92 (22) 10/92 (11)     
$50,001–70,000 29/92 (32) 17/92 (19) 0.85 0.32 2.24  
more than $70,000 43/92 (47) 65/92 (71) 0.33 0.14 0.77 **p = 0.004
Mother paid work/study 7 (7) 6 (6) 1.20 0.50 2.86 p = 0.687
Private health insurance 51 (51) 78 (80) 0.27 0.14 0.50 **p = 0.000
Baby's age in days       
(mean and range) 33.7 (6–728) 34 (13–77)     t-test ns
median 16 36     
Multiple birth (twins) 3 (3) 3 (3) 0.99 0.19 5.03 p = 0.990
Primiparity 69 (69) 60 (61) 0.69 0.39 1.24 p = 0.216
Caesarean section 35 (35) 32 (32) 1.13 0.63 2.03 p = 0.690
  1. (n = 100 women with mastitis and 99 breastfeeding controls). Melbourne, Australia, 2002–2004.
  2. *chi-square test for all analyses, except t-test for mother's and baby's age.
  3. **statistically significant.
  4. ns = not significant.