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Table 4 Association of characteristics of the population with β-HCH level (ng/g lipid): GMR from multiple linear regression in the whole population and stratified by sub-area

From: A biomonitoring study on blood levels of beta-hexachlorocyclohexane among people living close to an industrial area

  β-HCH β-HCH β-HCH
(Area 1–4) (Area 4) (Area 1–3)
  GMR 95%CI GMR 95%CI GMR 95%CI
Sex
Males 1.00   1.00   1.00  
Females 1.20 0.98-1.47 1.17 0.84-1.65 1.30 1.03-1.63
Age group (years)
25-34 1.00   1.00   1.00  
35-44 1.34 0.99-1.80 1.28 0.77-2.13 1.56 1.12-2.17
45-54 1.92 1.40-2.62 1.56 0.94-2.58 2.48 1.75-3.53
55-64 2.76 2.04-3.74 2.51 1.52-4.13 3.51 2.49-4.95
Level of Education
Primary school 1.00   1.00   1.00  
Secondary school 0.78 0.62-0.98 0.81 0.54- 1.21 0.81 0.64-1.02
University degree 0.86 0.57-1.29 0.91 0.41-1.99 0.93 0.63-1.37
Area of residence*
Area 1 1.00      
Area 2 0.98 0.68-1.41     
Area 3 1.32 0.91-1.93     
Area 4 2.00 1.36-2.94     
Any use of well water
No 1.00   1.00   1.00  
Yes 1.42 1.08-1.88 1.46 0.97-2.20 1.42 0.97-2.08
Provenience of food§
Commercial 1.00   1.00   1.00  
Local 1.16 0.89-1.52 1.75 0.97-3.18 1.00 0.78-1.29
Own production 1.26 0.94-1.69 2.27 1.24-4.13 0.75 0.55-1.01
Consume of Beef§
 None/commercial 1.00   1.00   1.00  
 Local 0.91 0.61-1.35 0.84 0.50-1.43 0.81 0.36-1.83
 Own production 1.88 1.35-2.63 1.67 1.09-2.57 dropped
Consume of Chickens§
 None/commercial 1.00   1.00   1.00  
 Local 1.08 0.72-1.60 1.06 0.56- 1.98 1.33 0.73-2.43
 Own production 1.36 0.99-1.85 1.63 1.04-2.55 0.67 0.36-1.83
  1. *Area 1: reference; Area 2: Colleferro urban/rural; Area 3: industrial; Area 4: river.
  2. GMR: Geometric Mean Ratio from multivariate linear regression model.
  3. 95%CI: 95% Confidence Intervals.
  4. § the model with the variables consume of beef and consume of chicken is alternative to the model with the variable provenience of food.