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Table 2 Iodine content of salt tested by iodometric titration method in a representative salt sample (n= 775) positive for iodine content by rapid test kit (RTK) at different geographical provinces and national level in Saudi Arabia, 2012

From: Assessment of household use of iodized salt and adequacy of salt iodization: a cross-sectional National Study in Saudi Arabia

Geographical areas No. of Salt Samples % of salt samples at various iodine concentrations (ppm) Mean (SD) Median (IQR)
<15 15-40 >40
Central province 172 7.0 37.8 55.2 42.76 (21.30) 43.5 (27.0-54.0)
Western province 182 1.6 14.3 84.1 54.32 (16.88) 53.0 (44.0-65.0)
Eastern province 142 12.7 20.4 66.9 51.33 (27.91) 54.0 (29.0-69.0)
Northern province 154 1.3 25.6 73.1 52.10 (21.05) 52.0 (38.0-64.0)
Southern province 125 0.0 24.0 76.0 52.44 (18.98) 51.0 (41.0-64.0)
National 775 4.8 24.5 70.7 50.40 (21.80) 51.0 (37.0-63.0)
  1. Abbreviations: RTK rapid test kit; SD Standard Deviation; IQR Interquartile Range 25%-75%
  2. There was a significant difference in iodized salt samples among regions (χ2 = 68.42; df = 8; P < 0.001).