| | Characteristic (chi-sq. value±) | <40 years | 40+ years | | (%) | (%) |
| | Total ( 35,053) | 14,540 (41.5) | 20,513 (58.5) | | Age at diagnosis††† | | | | Mean (std dev) | 30.01 (6.37) | 54.82 (11.42) | | Median age at diagnosis | 31 | 52 | | Histology*** | | | | Papillary | 13,215 (90.9) | 17,883 (87.2) | | Follicular | 1,325 (9.1) | 2,630 (12.8) | | Race and ethnicity*** | | | | Non-Hispanic White | 10,901 (75.0) | 15,428 (75.2) | | Non-Hispanic Black | 774 (5.3) | 1,270 (6.2) | | Hispanic | 1,437 (9.9) | 1,490 (7.3) | | Asian/Pacific Islander | 1,428 (9.8) | 2325 (11.3) | | Marital status*** | | | | Married/Common law | 8,471 (58.3) | 13,575 (66.2) | | Not married | 5,618 (38.6) | 6,138 (29.9) | | Unknown | 451 (3.1) | 800 (3.9) | | Multiple primary cancers*** | | | | One primary only | 13,616 (93.7) | 17,973 (87.6) | | 1st of 2+ primaries | 924 (6.4) | 2,540 (12.4) | | SEER Historic Stage A*** | | | | Localized | 8,857 (60.9) | 13,691 (66.7) | | Regional | 5,288 (36.4) | 6,112 (29.8) | | Distant | 395 (2.7) | 710 (3.5) | | Surgical treatment*** | | | | Surgery | 14,457 (99.4) | 20,202 (98.5) | | No surgery | 83 (0.6) | 311 (1.5) | | Radiation treatment** | | | | Radiation | 6,655 (45.8) | 9,012 (43.9) | | No radiation | 7,885 (54.2) | 11,501 (56.1) | | Tumor size (1983+)*** | | | | 0-1 cm | 2,814 (22.7) | 5,760 (31.1) | | 1.1–2 cm | 4,048 (32.6) | 5,003 (27.0) | | 2.1–4 cm | 3,450 (27.8) | 4,144 (22.4) | | >4 cm | 796 (6.4) | 1,414 (7.6) | | Unknown | 1,315 (10.6) | 2,203 (11.9) | | SEER registry*** | | | | San Francisco-Oakland | 2,222 (15.3) | 2,776 (13.5) | | Connecticut | 1,745 (12.0) | 3,013 (14.7) | | Detroit | 2,055 (5.9) | 3,254 (15.9) | | Hawaii | 828 (5.7) | 1,315 (6.4) | | Iowa | 1,664 (11.4) | 2,198 (10.7) | | New Mexico | 959 (6.6) | 1,564 (7.6) | | Seattle | 2,161 (14.9) | 2,901 (14.1) | | Utah | 1,576 (10.8) | 1,662 (8.1) | | Atlanta | 1,330 (9.2) | 1,830 (8.9) | | Rural-Urban continuum Designation (county at diagnosis†)*** | | | | Metropolitan counties | 12,996 (89.4) | 18,048 (88.0) | | Nonmetropolitan counties | 1,544 (10.6) | 2,465 (12.0) | | Socioeconomic status—% poverty (county at diagnosis†) 1992+** | | | | Tertile 1 (high poverty/low SES) | 1,330 (14.0) | 2,426 (15.7) | | Tertile 2 | 4,280 (44.9) | 6,670 (43.2) | | Tertile 3 (low poverty/high SES) | 3,920 (41.1) | 6,350 (41.1) | | Vital status*** | | | | Alive | 14,134 (97.2) | 16,912 (82.5) | | Dead | 406 (2.8) | 3,601 (17.6) | | Median follow-up time (years) | 11.42 | 7.25 | | Range | 0.00–34.92 | 0.00–34.92 |
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