Table 4.

Multivariate analysis of prognostic factors for overall survival

Prognostic factor	χ2	p-value
Type of surgery	3.357	0.030
Pathological details  Gross invasion  Extrathyroidal extension  Capsular invasion  Completeness of resection	4.681 0.310 0.617 0.970	0.030 0.048 0.027 0.009
Postoperative details  Adjuvant radioactive iodine  Metastasis  Recurrence  External beam radiotherapy	1.066 4.404 0.348 0.476	0.044 0.009 0.038 0.001
Scoring systems  TNM  AGES  MACIS  AMES  EORTC	1.021 11.090 14.766 2.002 2.455	0.635 0.008 0.003 0.170 0.113

AGES = Age, Grade, Extent, Size; AMES = Age, Metastases, Extent, Sex; EORTC = European Organisation for Research and Treatment of Cancer; TNM = Tumour, Nodes, Metastases; MACIS = Metastases, Age, Completeness of resection, Invasion, Size