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Table 1 Medical history of women 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
Blood type      
  A 158 (44.13) 74 (52.11) Reference   0.369
  B 28 (7.82) 12 (8.45) 1.09 0.53–2.27  
  AB 19 (5.31) 5 (3.52) 1.78 0.64–4.95  
  O 153 (42.74) 51 (35.92) 1.41 0.92–2.14  
Rh factor      
  Positive 275 (78.13) 121 (85.82) Reference   0.052
  Negative 77 (21.88) 20 (14.18) 1.69 0.99–2.90  
Mastitis in the family      
  No 191 (62.01) 120 (83.92) Reference   < 0.001
  Yes 117 (37.99) 23 (16.08) 3.20 1.93–5.28  
Mastitis in previous breastfeedings**     
  No 53 (48.62) 54 (87.10) Reference   < 0.001
  Yes 56 (51.38) 8 (12.90) 7.13 3.10–16.39  
Breast cancer in the family      
  No 265 (74.44) 99 (68.28) Reference   0.161
  Yes 91 (25.56) 46 (31.72) 0.74 0.48–1.13  
Breast surgery      
  No 341 (94.99) 141 (97.24) Reference   0.378
  Yes 18 (5.01) 4 (2.76) 1.86 0.62–5.60  
Gastrointestinal disease      
  No 267 (74.17) 113 (76.87) Reference   0.524
  Yes 93 (25.83) 34 (23.13) 1.16 0.74–1.82  
Urinary infection      
  No 286 (78.36) 128 (86.49) Reference   0.035
  Yes 79 (21.64) 20 (13.51) 1.77 1.04–3.01  
Vaginal candidiasis      
  No 279 (76.23) 127 (85.81) Reference   0.016
  Yes 87 (23.77) 21 (14.19) 1.89 1.12–3.17  
Eye infection      
  No 335 (91.78) 139 (93.92) Reference   0.408
  Yes 30 (8.22) 9 (6.08) 1.38 0.64–2.99  
Ear infection      
  No 350 (95.89) 145 (97.97) Reference   0.370
  Yes 15 (4.11) 3 (2.03) 2.07 0.59–7.26  
Lip or nose infection      
  No 285 (77.87) 125 (84.46) Reference   0.092
  Yes 81 (22.13) 23 (15.54) 1.54 0.93–2.57  
Throat infection      
  No 258 (70.88) 126 (85.71) Reference   < 0.001
  Yes 106 (29.12) 21 (14.29) 2.47 1.47–4.12  
Skin infection      
  No 301 (82.47) 137 (92.57) Reference   0.003
  Yes 64 (17.53) 11 (7.43) 2.65 1.35–5.18  
Allergies      
  No 250 (68.31) 106 (71.62) Reference   0.461
  Yes 116 (31.69) 42 (28.38) 1.17 0.77–1.78  
Autoimmune disease      
  No 352 (96.17) 146 (98.65) Reference   0.237
  Yes 14 (3.83) 2 (1.35) 2.90 0.65–12.94  
Asthma      
  No 347 (94.81) 140 (94.59) Reference   0.922
  Yes 19 (5.19) 8 (5.41) 0.96 0.41–2.24  
Anemia      
  No 305 (83.33) 135 (91.84) Reference   0.013
  Yes 61 (16.67) 12 (8.16) 2.25 1.17–4.32  
Gestational diabetes      
  No 342 (93.96) 139 (93.92) Reference   0.987
  Yes 22 (6.04) 9 (6.08) 0.99 0.45–2.21  
Thyroid disease      
  No 335 (91.78) 133 (89.86) Reference   0.487
  Yes 30 (8.22) 15 (10.14) 0.79 0.41–1.52  
Smoker      
  No 291 (80.17) 116 (78.38) Reference   0.649
  Yes 72 (19.83) 32 (21.62) 0.90 0.56–1.43  
Social drinker      
  No 195 (54.17) 84 (57.14) Reference   0.541
  Yes 165 (45.83) 63 (42.86) 1.13 0.77–1.66  
  1. Cases and controls were asked to present any of these medical conditions from 6 months before pregnancy to delivery.
  2. OR, odds ratio; CI, confidence interval.
  3. *The number of cases varies because of missing data.
  4. **Data from primiparous women were excluded for this analysis.