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Table 2 Medical history of breastfed infants participating in the study

From: Case–control study of risk factors for infectious mastitis in Spanish breastfeeding women

Variables Case, n* (%) Control, n* (%) OR 95% CI P-value
Sex      
  Female 157 (42.90) 78 (52.70) Reference   
  Male 209 (57.10) 70 (47.30) 1.48 1.01–2.18 0.043
Blood type      
  A 104 (39.69) 51 (48.11) Reference   
  B 29 (11.07) 4 (3.77) 3.56 1.19–10.66 0.011
  AB 16 (6.11) 1 (0.94) 7.85 1.01–60.82  
  O 113 (43.13) 50 (47.17) 1.11 0.69–1.78  
Rh factor      
  Positive 240 (91.60) 100 (94.34) Reference   
  Negative 22 (8.40) 6 (5.66) 1.53 0.60–3.88 0.370
APGAR test      
  < 9 26 (7.60) 3 (2.26) Reference   
  > 9 316 (92.40) 130 (97.74) 0.28 0.08–0.94 0.049
Jaundice      
  No 244 (67.22) 109 (74.15) Reference   
  Yes 119 (32.78) 38 (25.85) 1.40 0.91–2.15 0.125
Hypoglycemia      
  No 357 (97.01) 143 (96.62) Reference   
  Yes 11 (2.99) 5 (3.38) 0.88 0.30–2.58 0.818
Eczema      
  No 347 (94.29) 141 (95.27) Reference   
  Yes 21 (5.71) 7 (4.73) 1.22 0.51–2.93 0.658
Thrush      
  No 328 (89.13) 143 (96.62) Reference   
  Yes 40 (10.87) 5 (3.38) 3.49 1.35–9.02 0.006
Micrognathia/Retrognathia      
  No 355 (96.47) 147 (99.32) Reference   
  Yes 13 (3.53) 1 (0.68) 5.38 0.70–41.52 0.132
Tongue-tie      
  No 255 (71.63) 134 (90.54) Reference   
  Yes 101 (28.37) 14 (9.46) 3.79 2.09–6.89 < 0.001
Child hospitalized after birth      
  No 323 (90.73) 134 (96.40) Reference   
  Yes 33 (9.27) 5 (3.60) 2.74 1.05–7.16 0.033
  1. OR, odds ratio; CI, confidence interval.
  2. *The number of cases varies because of missing data.