Table 2. Comparison of the incidence of hypothyroidism among initially diagnosed breast cancer patients, breast benign diseases patients and patients during chemotherapy.

Groups	case	Age	Incidence of clinical hypothyroidism	Incidence of subclinical hypothyroidism	Incidence of Low T3 syndrome	Incidence of total hypothyroidism
Initially diagnosed BC patients	726	51.03±10.98	2.2%(16/726)	20.25% (147/726)	6.2% (45/726)	28.65% (208/726)
BBD patients	336	44.5±12.23*	2.38% (8/336)	24.4% (82/336)	5.95% (20/336)	32.74% (110/336)
during chemotherapy	153	49.03±8.50*	2.61% (4/153)	21.57% (33/153)	6.54% (10/153)	30.72% (47/153)

^*p<0.05 vs. initially diagnosed breast cancer.