Skip to main content

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.