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Table 2 TDI- and TMA-specific IgG concentrations in urethane foam factory workers and controls

From: Evaluation of chemical-specific IgG antibodies in male workers from a urethane foam factory

Geometric mean of IgG (95% CI) (μg/mL)
Controls Urethane foam factory workers
Number for TDI (TMA) TDI TMA Number TDI TMA P value*
Median of IgG (range) 0.81 (ND–12.9) 1.77 (ND–36.8)   2.07 (ND–29.1) 2.58 (ND–74.6) < 0.001 (TDI) 0.026 (TMA)
Age (years)
 Below 39 23 (23) 1.22 (0.75, 1.98) 3.26 (2.09, 5.08) 44 1.69 (1.10, 2.59) 2.44 (1.46, 4.07)  
 40–49 23 (22) 1.41 (0.91, 2.18) 1.46 (0.64, 3.32) 19 1.91 (0.94, 3.86) 2.33 (1.07, 5.08)  
 50 and above 41 (40) 0.64 (0.35, 1.20) 1.92 (1.26, 2.93) 12 2.82 (1.47, 5.42) 2.41 (0.94, 6.19)  
P value#   0.033 0.173   0.341 0.451  
Median (25 and 75 percentile) 37 (31, 47)   49 (39, 52) < 0.001
Allergic history       
 No 49 (48) 1.19 (0.89, 1.61) 2.01 (1.39, 2.91) 50 1.95 (1.33, 2.85) 2.24 (1.36, 3.71)  
 Yes 38 (37) 0.75 (0.40, 1.42) 2.22 (1.29, 3.80) 25 1.79 (1.00, 3.20) 2.78 (1.64, 4.71)  
P value$   0.686 0.716   0.800 0.757  
Smoking habit**
 No 61 (60) 0.95 (0.70, 1.29) 1.83 (1.23, 2.71) 39 1.76 (1.09, 2.82) 2.12 (1.35, 3.34)  
 Yes 26 (25) 1.06 (0.46, 2.47) 2.90 (1.87, 4.49) 36 2.07 (1.38, 3.12) 2.75 (1.48, 5.12)  
P value#   0.496 0.195   0.668 0.311  
Habitual alcohol drinking**
 No 62 (61) 0.90 (0.58, 1.39) 2.15 (1.47, 3.14) 37 1.80 (1.05, 3.06) 3.24 (2.02, 5.20)  
 Yes 25 (24) 1.19 (0.83, 1.71) 1.99 (1.16, 3.43) 38 2.00 (1.41, 2.84) 1.82 (1.02, 3.24)  
P value$   0.262 0.577   0.678 0.145  
  1. ND not detected
  2. #P values were obtained using Kruskal–Wallis test
  3. $P values were obtained using Mann–Whitney U test
  4. *P values were calculated for the comparison between controls and factory workers by Mann–Whitney U test
  5. **P values were less than 0.05 in comparison of the prevalence of smokers and alcohol drinkers between controls and factory workers