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Table 1 The general characteristics of breast cancer patients and healthy controls from Tunisian women blood donors

From: Combined effects of IL-8 and CXCR2gene polymorphisms on breast cancer susceptibility and aggressiveness

Characteristics, n (%)a

Cases

Controls

P-valueb

Ageb, yr

   

Mean ± SD

48.0 ± 24.

48.0 ± 14.9

0.97

Body mass index (BMI, kg/m 2 )

24.1 ± 5.4

20.6 ± 2.5

0.0004

History of benign breast disease

   

No

241 (58.92)

154 (45.18)

 

Yes

168 (41.08)

147 (54.82)

0.039

Use of oral contraceptive

   

No

143 (34.96)

141 (46.84)

 

Yes

266 (65.04)

160 (53.16)

0.001

  1. a Cases: n = 409; Controls: n = 301. The percentages were shown in the parentheses
  2. b Age and BMI were determined by two-sample t tests; history of benign breast disease and oral contraceptive drugs usage were determined by chi-square tests.