an increasing trendp<0.01
In the analysis of the histologic type of cancer, the proportion of papillary thyroid carcinoma showed an increasing trend (p<0.01).
In the analysis of the histologic type of cancer, the proportion of papillary thyroid carcinoma showed an increasing trend (p<0.01).
The proportion of cases of distant metastasis showed a decreasing trend during the study period (p for trend <0.01).