Table I.

Changes in TSH levels in treatment and non-treatment groups

Cytological feature	Initial TSH	Last TSH	Value of p
Treatment group (group 1; n = 74), mean ± SD	1.28 ±0.85	0.81 ±0.37	< 0.001
Adenomatous nodules (n = 33)	1.19 ±0.13	0.80 ±0.07	0.018
Colloid nodules (n = 18)	1.47 ±0.86	0.93 ±0.15	0.010
Cystic nodules (n = 23)	1.31 ±0.58	0.74 ±0.27	0.001
Non-treatment group (group 2; n = 54), mean ± SD	1.18 ±0.69	1.09 ±0.61	0.546
Adenomatous nodules (n = 20)	1.11 ±0.56	1.14 ±0.73	0.876
Colloid nodules (n = 15)	1.09 ±0.16	1.07 ±0.32	0.637
Cystic nodules (n = 19)	1.21 ±0.63	1.01 ±0.22	0.191

TSH – thyrotropin