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| Histological type | Before USI | During USI | After USI | P | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F | M | Ratio | F | M | Ratio | F | M | Ratio | ||||
| PTC | 99 | 27 | 3.7 | 3,010 | 834 | 3.6 | 9,982 | 3,553 | 2.8 | <0.001 | ||
| FTC | 5 | 4 | 1.3 | 58 | 22 | 2.6 | 37 | 23 | 1.6 | NS | ||
| MTC | 5 | 9 | 0.6 | 34 | 32 | 1.1 | 42 | 30 | 1.4 | NS | ||
PTC, papillary thyroid cancer; FTC, follicular thyroid cancer; MTC, medullary thyroid cancer; USI, universal salt iodization.
