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Household Salt samples and iodine content.
| Year of sample collection | Count | Iodine content Parts per million (ppm) |
|
|---|---|---|---|
| Average | Range | ||
| 1991 | - | 0.0a | 0.0–0.0 |
| 2007 | 185 | 47.3b | 2.1–163.9 |
| 2009 | 150 | 110.9d | 6.3–215.8 |
| 2010 | 118 | 63.7c | 2.1–126.9 |
| 2014 | 182 | 72.0c | 0.0–201.0 |
| 2017 | 151 | 72.4c | 1.1–201.0 |
| P value | 0.0004 | ||
| F ratio | 25.67 | ||
Values in the same column having the same superscripts are not significantly different from each other (p > 0.05).
