Skip to main content

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