Table 1.

Indications for surgical procedures performed in cohorts from University Medical Centre Mainz and the remaining PETS 2 hospitals

Preoperative diagnosis according to overall assessment*	Group 1 (UMC Mainz)		Group 2 (PETS 2)
	Total (n = 569)	iFS analysis (n = 203)	Total (n = 21 442)	iFS analysis (n = 4681)
Benign lesion	465 (81.7)	128 (63.1)	19 387 (90.4, )	3636 (77.7)
Suspected malignancy	57 (10.0)	55 (27.1)	1203 (5.6, )	728 (15.6)
Malignancy†	38 (6.7)	20 (9.9)	401 (1.9)	223 (4.8)
Completion surgery for malignancy	9 (1.6)	0 (0)	451 (2.1)	94 (2.0)

Values in parentheses are percentages.

^*Overall assessment includes clinical picture, sonography, elastography, scintigraphy, fine-needle aspiration cytology (with molecular genetic analyses), histology (for completion procedures only).

^†Intraoperative frozen-section (iFS) analysis values include lymph node assessments. UMC, University Medical Centre; PETS, Prospective Evaluation Study Thyroid Surgery.