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
| Â | Cases (N = 100) n (%) | Controls (N = 99) n (%) | Odds Ratio | 95% CI | Significance* | |
|---|---|---|---|---|---|---|
Mother's age (mean, years) | 33.5 | 31.7 | Â | Â | Â | **p = 0.004 |
Mother's education: | Â | Â | Â | Â | Â | Â |
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) | Â | Â | Â | Â | Â | Â |
up to $50,000 | 20/92 (22) | 10/92 (11) | Â | Â | Â | Â |
$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 | Â | Â | Â | Â | Â | Â |
(mean and range) | 33.7 (6–728) | 34 (13–77) |  |  |  | t-test ns |
median | 16 | 36 | Â | Â | Â | Â |
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 |