Table 3 Subgroup analysis on rate of benign histology
Variables | Number of benign histology (%) | p |
|---|---|---|
Age | 0.459 | |
< 65 years (n = 8,243) | 687 (8.3) | |
≥ 65 years (n = 3,285) | 260 (7.9) | |
Sex | < 0.001 | |
Male (n = 7,842) | 435 (5.5) | |
Female (n = 3,687) | 512 (13.9) | |
Incidentaloma (Korea data only) | < 0.001 | |
No (n = 4,862) | 231 (4.8) | |
Yes (n = 3,214) | 300 (9.3) | |
Preoperative biopsy (Korea data only) | 0.165 | |
No (n = 7,902) | 524 (6.6) | |
Yes (n = 175) | 7 (4.0) | |
Type of surgery | < 0.001 | |
Radical (n = 5,314) | 224 (4.2) | |
Partial (n = 5,215) | 723 (13.9) | |
Surgical method | < 0.001 | |
Open (n = 5,056) | 262 (5.2) | |
Laparoscopic (n = 4,043) | 416 (10.3) | |
Robotic (n = 2,430) | 269 (11.1) | |
Year of surgery | < 0.001 | |
− 2000 (n = 486) | 6 (1.2) | |
2001–2005 (n = 1,550) | 116 (7.5) | |
2006–2010 (n = 3,975) | 350 (8.8) | |
2011–2015 (n = 5,518) | 475 (8.6) | |
Size of tumor | < 0.001 | |
≤ 2 cm (n = 2,920) | 367 (12.6) | |
> 2 cm and ≤ 4 cm (n = 4,436) | 369 (8.3) | |
> 4 cm and ≤ 7 cm (n = 2,515) | 134 (5.3) | |
> 7 cm (n = 1,658) | 77 (4.6) |