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Table 1 Characteristics of thyroid volume overall and by subgroups, Belarus, 1996-2004, total N = 10,703

From: Association between exposure to radioactive iodine after the Chernobyl accident and thyroid volume in Belarus 10-15 years later

  Overall, n (%) Thyroid volume (ml) P-valuea
Mean Median 95% CI IQR  
Overall 10,703 (100) 12.9 12.2 12.9, 13.0 5.5  
Sex       < 0.001
 Female 5472 (51) 12.0 11.4 11.9, 12.1 4.5  
 Male 5231 (49) 13.9 13.3 13.8, 14.1 6.2  
Age at screening (years)       < 0.001
 10-17 3312 (31) 10.5 10.0 10.4, 10.6 4.4  
 18-33 7391 (69) 14.0 13.2 13.9, 14.1 5.5  
Oblast of residence at screening       < 0.001
 Minsk 2973 (28) 13.1 12.3 12.9, 13.3 5.5  
 Gomel 6522 (61) 12.6 11.9 12.5, 12.7 5.3  
 Otherb 1208 (11) 14.6 13.7 14.2, 14.9 6.5  
Urban/rural status       0.096
 Urban 6537 (61) 12.8 12.1 12.7, 13.0 5.8  
 Rural 4166 (39) 13.1 12.4 13.0, 13.3 5.4  
Urinary iodine concentrationc (mcg/L)       0.002
 < 20 1156 (11) 13.5 12.7 13.2, 13.8 5.9  
 20-49 2781 (26) 13.0 12.2 12.8, 13.2 5.6  
 50-99 2993 (28) 12.9 12.2 12.7, 13.0 5.6  
 ≥ 100 3773 (35) 12.8 12.0 12.6, 12.9 5.4  
  1. Abbreviation: CI confidence interval, IQR interquartile range
  2. aP-values from the Kruskal-Wallis test
  3. bIncludes Brest, Grodno, Mogilev, and Vitebsk oblasts
  4. cWHO criteria for iodine deficiency: < 20 severe, 20-49 moderate, 50-99 mild, ≥100 not deficient [33]