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Table 1 Characteristics of the study population

From: Complex organochlorine pesticide mixtures as determinant factor for breast cancer risk: a population-based case–control study in the Canary Islands (Spain)

 

Healthy women (n = 103)

Patients (n = 121)

P

Age (years) Mean ± SD

45.3 ± 13.8

58.0 ± 11.7

<0.001

 < 35

31 (30.1%)

2 (1.7%)

<0.001

 35-44.9

23 (22.3%)

14 (11.6%)

 

 45-54.9

23 (22.3%)

35 (28.9%)

 

 55-64.9

17 (16.6%)

34 (28.1%)

 

 >65

9 (8.7%)

36 (29.7%)

 

BMI (kg/m2) Mean ± SD

26.3 ± 4.3

27.7 ± 4.8

0.031

Lactation

   

 ≤ 8 months

64 (84.2%)

63 (76.8%)

n. s.

 >9 months

12 (15.8%)

19 (23.2%)

Smoking

   

 Non-smokers

70 (70.7%)

95 (79.8%)

n. s.

 Smokers/Ex­smoker

29 (29.3%)

24 (20.2%)

Menopause

   

 Yes

6 (5.8%)

22 (18.2%)

0.024

 No

77 (74.8%)

98 (81%)

 ND

20 (19.4)

1 (0.8%)

  1. Abbreviations: BMI, body mass index; SD, standard deviation; ND, not determined;
  2. n. s., non-significant.