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Table 2 Correlates of mastitis incidence in women in the CASTLE study (n =346; 70 women with mastitis)

From: Determinants of mastitis in women in the CASTLE study: a cohort study

Correlate (occurring from hospital onwards)

Number of women with at least one mastitis event

Person-years at risk of first mastitis event

Estimated Incidence Rate Ratio (IRR)

95 % CI for IRR

p value

Any nipple damage

yes

55

31.8

2.17

1.21, 3.91

0.01

 

no

15

18.3

   

“Over-producing milk”

yes

26

9.7

2.60

1.58, 4.29

<0.005

 

no

44

40.4

   

Attachment problem

yes

45

24.3

1.96

1.18, 3.24

0.009

 

no

25

25.8

   

Use of nipple shield

yes

23

7.4

2.93

1.72, 5.01

<0.005

 

no

47

42.7

   

Expressing several times a day

yes

33

17.7

1.64

1.01, 2.68

0.047

 

no

37

32.4

   

Use of hydrogel dressings

yes

15

7.0

1.72

0.96, 3.09

0.071

 

no

55

43.0

   

S. aureus isolated from nipple

yes

46

26.5

1.72

1.04, 2.85

0.035

 

no

24

23.5

   

S. aureus isolated from milk

yes

44

24.6

1.78

1.08, 2.92

0.023

 

no

26

25.4

   

S. aureus isolated from infants

yes

55

34.1

1.74

0.97, 3.11

0.062

 

no

15

15.9