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Regional variations of median iodine content of drinking water in 2016.
| Province | No | Median (IQR) µg/L |
|---|---|---|
| Western | 67 | 15.6 (4.1–29.1) |
| Southern | 70 | 19.1 (15.3–29.9) |
| Central | 68 | 18.0 (5.7–44.6) |
| Northern | 78 | 53.4 (28.9–79.4) |
| Eastern | 189 | 33.3 (17.0–69.6) |
| North Western | 122 | 39.9 (9.4–61.4) |
| North Central | 170 | 75.5 (48.4–102.5) |
| Uva | 62 | 8.3 (4.6–50.4) |
| Sabaragamuwa | 108 | 31.3 (15.1–50.4) |
| Sri Lanka | 934 | 33.4 (12.3–66.8) |
Note: p = 0.000.
