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Demographics of study population.
| Controls (n = 347) | PTC (n = 316) | P value | |
| Age (yr, mean ± SD) | 44.0 ± 8.7 | 43.8 ± 13.3 | .84 |
| Gender | |||
| Male | 84 (24.2) | 69 (21.8) | .47 |
| Female | 263 (75.8) | 247 (78.2) | |
| T classification | |||
| Tx | 20 (6.3) | ||
| T1 and T2 | 89 (28.2) | ||
| T3 and T4 | 207 (65.5) | ||
| N classification | |||
| N0 | 118 (37.3) | ||
| N1a and N1b | 198 (62.7) | ||
| M classification | |||
| Mx | 2 (0.6) | ||
| M0 | 312 (98.7) | ||
| M1 | 2 (0.6) | ||
| Multiplicity of tumor | |||
| Yes | 87 (27.5) | ||
| No | 229 (72.5) |
PTC = papillary thyroid carcinoma, SD = standard deviation.
