Effectiveness and Safety of Levothyroxine Tablets Combined with Iodine-131 in the Treatment of Thyroid Cancer

Table 3

Comparison of cancer recurrence and metastasis (n (%)).

Group	Cases	1 year after surgery	3 years after surgery	5 years after surgery
Observation group	35	3 (9%)	8 (26%)	11 (31%)
Control group	35	1 (3%)	2 (6%)	4 (11%)
x^2	—	2.832	10.857	7.925
	—	0.092	0.001	0.005