Table 4. Comparison of Multivariate Analyses for Recurrence of Well-Differentiated Thyroid Cancer across Different International Studies.

Risk factor	Our data	Palme et al. (2004) [15]	Baek et al. (2010) [7]	Kim et al. (2014) [16]	Ito et al. (2012) [17]
Age	√	X	X	X	√
Male sex	X	√	X	√	√
Tumor size	X	√	X	X	√
Nodal metastases	√	√	√	√	√
Distant metastases	√	√	NA	√	NA
Histologic type	√	X	NA	√	NA
Multifocality	√	X	X	X	NA
Incomplete thyroidectomy	X	√	X	X	NA
Postsurgical radioactive iodine ablation	√	X	NA	NA	NA

NA, not assessed.