Table 1.

Demographic and Tumor Characteristics of University of Chicago Thyroid Cancer Cohort (n = 257)

	Radiation exposure (n = 92)	No radiation exposure (n = 165)	p
Age at first thyroid surgery, years	34.4 ± 13.6	36.7 ± 16.3	0.25
Sex			0.01
Female	52 (56.5%)	120 (72.7%)
Male	40 (43.5%)	45 (27.3%)
Treatment			0.88
Total or near total	60 (65.2%)	106 (63.9%)
Subtotal or lobectomy	32 (34.8%)	59 (36.1%)
Radioactive iodine			0.74
Received	46 (50%)	86 (52.1%)
Did not receive	46 (50%)	79 (47.9%)
Histology (n = 104)			0.83
Classic papillary	40 (93.1%)	56 (91.8%)
Follicular variant	2 (4.6%)	3 (4.8%)
Columnar	0 (0%)	1 (1.6%)
Follicular	1 (2.3%)	1 (1.6%)
Multifocality			0.89
Unifocal	51 (55.4%)	93 (56.4%)
Multifocal	41 (44.6%)	72 (43.6%)
Lymph node involvement			0.72
0	56 (60.9%)	99 (60.0%)
1–5	20 (21.7%)	42 (25.5%)
>5	16 (17.4%)	24 (14.5%)
Extrathyroidal invasion	36 (39.1%)	56 (33.7%)	0.39
Stage			0.10
1	83 (90.2%)	127 (77.0%)
2	2 (2.2%)	8 (4.8%)
3	1 (1.1%)	7 (4.2%)
4a	4 (4.3%)	13 (7.9%)
4b	2 (2.2%)	10 (6.1%)
Decade of diagnosis			0.15
Before 1960	10 (6.5%)	12 (13.5%)
1960–1969	12 (7.8%)	10 (11.2%)
1970–1979	74 (48.1%)	42 (47.2%)
After 1980	58 (37.7%)	25 (28.1%)
Primary treatment site			0.12
University of Chicago	60 (65.2%)	91 (55.2%)
Other	74 (44.9%)	32 (34.8%)