Table 1 Comparison of characteristics between two groups of case and control.

From: The association between dietary antioxidant index with tumor size, proliferation marker, and the odds of breast cancer in Iranian women

Variable

Case group (N = 155)

Control group (N = 155)

P – value*

DAI score

9.51 ± 8.47

8.89 ± 11.15

0.58

Age (years)

46.72 ± 10.78

46.66 ± 11.15

0.96

BMI (kg/m2)

26.88 ± 4.08

25.92 ± 4.34

0.04

P.A (met-min/week)

812.77 ± 780.30

777.39 ± 769.04

0.68

Energy (kcal/d)

2365.19 ± 675.33

2283.27 ± 692.500

0.29

Magnesium (mg)

347.75 ± 125.38

355.00 ± 130.98

0.61

Vitamin C (mg)

127.09 ± 77.80

107.83 ± 72.04

0.02

Vitamin A (RE)

665.35 ± 346.10

627.63 ± 380.41

0.36

Vitamin E (mg)

19.76 ± 9.25

19.61 ± 12.27

0.90

Zinc (mg)

12.11 ± 3.83

12.09 ± 3.67

0.96

Selenium (µg)

97.38 ± 44.50

96.30 ± 35.82

0.81

Education, n (%)

 

< 0.001a

 Illiterate

17 (11.0)

2 (1.3)

 Elementary

16 (10.3)

5 (3.2)

 Middle school

18 (11.6)

17 (11.0)

 High school and diploma

55 (35.5)

57 (36.8)

 University

49 (31.6)

74 (47.7)

Employment status, n (%)

  

0.38 a

 Employed

36 (23.2)

45 (29.0)

 Retired

5 (3.2)

7 (4.5)

 Housewife

114 (73.5)

103 (66.5)

Marital status, n (%)

 

< 0.001a

 Single

9 (5.8)

36 (23.2)

 Married

122 (78.7)

103 (66.5)

 Widow

18 (11.6)

4 (2.6)

 Divorced

6 (3.9)

12 (7.7)

History of pregnancy, n (%)

 

< 0.001a

 Yes

143 (92.3)

108 (69.7)

 No

12 (7.7)

47 (30.3)

History of breastfeeding, n (%)

 

< 0.001a

 Yes

136 (87.7)

102 (65.8)

 No

19 (12.3)

53 (34.2)

Breastfeeding duration (years)

4.31 ± 3.25

2.33 ± 2.67

< 0.001

Age of first menstruation (years)

13.75 ± 1.34

13.49 ± 1.54

0.11

Number of abortions, n (%)

 

0.06a

 0

101 (65.2)

124 (80.0)

 1

33 (21.3)

18 (11.6)

 2

16 (10.3)

9 (5.8)

 3

4 (2.6)

3 (1.9)

 5

1 (0.6)

1 (0.6)

 

Smoking status, n (%)

 

0.20a

 Smoker

15 (9.7)

9 (5.8)

 Non smoker

140 (90.3)

146 (94.2)

Alcoholic beverages, n (%)

 

0.12a

 Yes

8 (5.2)

3 (1.9)

 No

147 (94.8)

152 (98.1)

Use of contraceptive pills, n (%)

 

0.001a

 Yes

50 (32.3)

24 (15.5)

 No

105 (67.7)

131 (84.5)

Family history of cancer, n (%)

 

< 0.001a

 Yes

41 (26.5)

10 (6.5)

 No

114 (73.5)

145 (93.5)

Menopause status, n (%)

  

< 0.001a

 Yes

53 (34.2)

25 (16.1)

 No

102 (65.8)

130 (83.9)

  1. Data are means ± SD for quantitative variables and frequency (percent) for qualitative variables.
  2. *From Independent t-test for quantitative variables, a. Chi-square for qualitative variables.
  3. DAI: Dietary antioxidant index, BMI; body mass index, PA: physical activity.