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Table 5 Thyroid volume (Tvol) and goitre prevalence in children (n = 419) and women (n = 405), stratified for examiners 1 and 2, before and after the correction of examiner 2's Tvol.

From: Data quality and practical challenges of thyroid volume assessment by ultrasound under field conditions - observer errors may affect prevalence estimates of goitre

  Examiner 1
(n = 406)
Examiner 2
(n = 418)
P-value
   Before correction After correction  
Children, (n) 209 210 210 -
Tvol (mL), median (P25-P75) 5.7 (4.3-7.6) 3.3 (2.3-4.2) 4.6 (3.2-6.0) <0.001c
Goitrea n (%) 112 (69) 18 (11) 75 (44) <0.001d
Women, (n) 197 208 208 -
Tvol (mL), median (P25-P75) 10.3 (8.6-12.9) 5.8 (4.6-7.6) 8.3 (6.6-10.8) <0.001c
Goitreb n (%) 11 (6) 2 (1) 7 (3) 0.01/0.34d
  1. aInternational reference values for Tvol for age [5]
  2. bThyroid enlargement was defined as a Tvol exceeding 18 ml for women [16]
  3. cMann-Whitney test (examiner 1 and examiner 2, same p-value before and after correction)
  4. dChi-square test (examiner 1 and examiner 2, before and after correction)