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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.