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Table 1 Demographic and exposure data of subjects exposed to PCB and of control subjects

From: Neuropsychological effects of chronic low-dose exposure to polychlorinated biphenyls (PCBs): A cross-sectional study

  PCB Controls    
  Mean SD Mean SD F[1,56] p  
Gender [N; m/f] 18/12   12/18   1.671 0.20  
Age [a] 48.2 7 49.9 7 0.89 0.35  
Education [a] 2 12.5 2 12.4 2 0.03 0.86  
Vocational index 2 5.9 0 5.8 0 0.39 0.54  
Estimated intelligence [IQ] 2 117.3 5 117.3 4 0.00 0.99  
Height [cm] 174 8 169 7 1.913 0.17  
Weight [kg] 76 14 66 12 3.003 0.09  
BMI [kg/m2] 24.7 3 23.5 3 2.273 0.14  
Self-reported data
Alcohol consumption [g/week] 94.4 76 72.4 75 1.26 0.27  
Nikotin consumption [cig./d] 6.4 10 5.7 10 0.07 0.79  
Q16-Score 4 4.4 4 3.6 4 0.67 0.42  
EQ Euroquest complaint score 4 146.4 32 131.6 31 3.29 0.07  
Memory and attention 27.0 6 23.9 6 3.62 0.06  
Drive and motivation 23.7 6 19.7 6 6.17 0.02 *
Tiredness 25.2 6 23.0 6 1.98 0.16  
Emotional reactivity 20.0 6 17.7 6 2.41 0.13  
Sensory complaints 8.1 3 7.4 3 0.65 0.42  
Motor complaints 5.2 2 4.8 2 0.96 0.33  
Cardiovascular complaints 14.8 5 12.0 5 4.76 0.03 *
Bowel and stomach 9.7 3 10.5 3 0.96 0.33  
Head and neck 11.0 4 12.3 4 1.90 0.17  
Stress inventory score 4 25.6 44 23.0 43 0.05 0.82  
Exposure indices
PCB-28 [μg/l] 0.28 0.25 0.016 5 0.02   0.0001 ***
PCB-101 [μg/l] 0.07 0.09 0.01 5 0   0.0003 ***
PCB-138 [μg/l] 1.29 0.69 1.13 0.46 1.44 0.16  
PCB-153 [μg/l] 1.68 0.96 1.56 0.58 1.07 0.29  
PCB-180 [μg/l] 1.14 0.65 0.94 0.39 1.76 0.08  
Total PCBs [μg/l] 4.45 2.44 3.65 1.40 1.87 0.067  
Total occupational time [a] 20.9 6 22.0 9 1.09 0.28  
Duration of exposure [a] 6 16.7 9 n.a.     
Weighted duration of exposure [a] 6,7 10.5 6 n.a.     
  1. 1χ2[1]; *: p < 0.05; ***: p < 0.001.
  2. 2 According to [76]
  3. 3 Statistically adjusted for gender, F[1,55]
  4. 4 A greater score corresponds to a greater number of complaints
  5. 5 Median and IQR/2 is given, 95 percent < measurement threshold
  6. 6 n.a.: not applicable
  7. 7 Considering mean time of presence at school.