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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.