Table 1.
Characteristics of Patients by Extent of Thyroid Surgerya
| NCDB |
SEER |
|||||
|---|---|---|---|---|---|---|
| Thyroid Lobectomy (n = 3151) | Total Thyroidectomy (n = 26 371) | P Value | Thyroid Lobectomy (n = 1379) | Total Thyroidectomy (n = 12 131) | P Value | |
| Patient age, y (mean ± SD) | 34 ± 7 | 34 ± 7 | NS | 34 ± 7 | 34 ± 7 | NS |
| Female gender | 2701 (86%) | 21 748 (83%) | <.01 | 1182 (86%) | 9966 (82%) | <.01 |
| Race | NS | NS | ||||
| White | 2698 (87%) | 22 709 (88%) | 1136 (83%) | 10 003 (83%) | ||
| Black | 191 (6%) | 1324 (5%) | 69 (5%) | 514 (4%) | ||
| Other | 200 (7%) | 1747 (7%) | 165 (12%) | 1513 (13%) | ||
| Annual income | <.01 | |||||
| <$35 000 | 842 (28%) | 5846 (24%) | — | — | ||
| ≥$35 000 | 2120 (72%) | 18 955 (76%) | — | — | ||
| Insurance status | <.01 | |||||
| Not insured | 126 (4%) | 778 (3%) | — | — | ||
| Insured | 2933 (96%) | 24 785 (97%) | — | — | ||
| Tumor size, cm | NS | NS | ||||
| 1.1–2.0 | 1696 (54%) | 14 444 (55%) | 722 (52%) | 6494 (54%) | ||
| 2.1–4.0 | 1455 (46%) | 11 927 (45%) | 657 (48%) | 5637 (47%) | ||
| Extrathyroidal extension | <.01 | <.01 | ||||
| Absent | 2569 (94%) | 20 225 (85%) | 1275 (93%) | 10 056 (83%) | ||
| Present | 159 (6%) | 3684 (15%) | 103 (8%) | 2053 (17%) | ||
| Nodal disease | <.01 | <.01 | ||||
| Absentb | 2822 (92%) | 17 665 (68%) | 1256 (92%) | 8391 (69%) | ||
| Present | 240 (8%) | 8326 (32%) | 114 (8%) | 3711 (31%) | ||
| Margin status | <.01 | |||||
| Negative | 2720 (95%) | 20 994 (87%) | — | — | ||
| Positive | 156 (5%) | 3110 (13%) | — | — | ||
| RAI administration | 1048 (35%) | 16 553 (67%) | <.01 | 356 (27%) | 7847 (67%) | <.01 |
Abbreviation: RAI, radioactive iodine.
a
Values are presented as percentages of given sample size. Unknown and missing data were excluded from the statistical analyses. Dashes (—) indicate unavailable data. Insurance data were incomplete in the SEER dataset before 2012.
b
Percentage of patients whose lymph nodes were not examined and those without evidence of lymph node metastases upon pathological examination.