Table 2.
Patient characteristics by year for low-risk group*
| Characteristic | 1992–1995 (N = 13 172), No. (%) | 1996–1999 (N = 14 541), No. (%) | 2000–2002 (N = 10 513), No. (%) | 2003–2005 (N = 8502), No. (%) |
| Age, y | ||||
| 66–69 | 3183 (24.2) | 3998 (27.5) | 2743 (26.1) | 2491 (29.3) |
| 70–74 | 4782 (36.3) | 5040 (34.7) | 3499 (33.3) | 2727 (32.1) |
| 75–79 | 3158 (24.0) | 3450 (23.7) | 2717 (25.8) | 2023 (23.8) |
| 80–84 | 1464 (11.1) | 1469 (10.1) | 1137 (10.8) | 930 (10.9) |
| ≥85 | 585 (4.4) | 584 (4.0) | 417 (4.0) | 331 (3.9) |
| Clinical tumor stage† | ||||
| 1 | 7728 (58.7) | 10 120 (69.6) | 7619 (72.5) | 6736 (79.2) |
| 2 | 5444 (41.3) | 4421 (30.4) | 2894 (27.5) | 1766 (20.8) |
| 3 | 0 | 0 | 0 | 0 |
| 4 | 0 | 0 | 0 | 0 |
| Unknown | 0 | 0 | 0 | 0 |
| WHO grade‡ | ||||
| 1 | 4401 (33.4) | 2261 (15.5) | 619 (5.9) | 251 (3.0) |
| 2 | 8771 (66.6) | 12 280 (84.5) | 9894 (94.1) | 8251 (97.0) |
| 3 | 0 | 0 | 0 | 0 |
| Undifferentiated | 0 | 0 | 0 | 0 |
| Unknown | 0 | 0 | 0 | 0 |
| Charlson comorbidity index | ||||
| 0 | 10 249 (77.8) | 11 287 (77.6) | 8000 (76.1) | 6466 (76.1) |
| 1 | 2055 (15.6) | 2254 (15.5) | 1738 (16.5) | 1353 (15.9) |
| 2 | 539 (4.1) | 624 (4.3) | 513 (4.9) | 438 (5.2) |
| ≥3 | 329 (2.5 | 376 (2.6 | 262 (2.5) | 245 (2.9) |
| Race | ||||
| Non-Hispanic white | 10 806 (82.0) | 11 661 (80.2) | 8133 (77.4) | 6395 (75.2) |
| Non-Hispanic black | 1106 (8.4) | 1321 (9.1) | 941 (9.0) | 710 (8.4) |
| Hispanic | 686 (5.2) | 909 (6.3) | 808 (7.7) | 838 (9.9) |
| Asian | 531 (4.0) | 614 (4.2) | 591 (5.6) | 527 (6.2) |
| Other/unknown | 43 (0.3) | 36 (0.2) | 40 (0.4) | 32 (0.4) |
| Median income§ | ||||
| 0–$35 654 | 3059 (23.2) | 3173 (21.8) | 2157 (20.5) | 1667 (19.6) |
| $35 655–46 118 | 3587 (27.2) | 3714 (25.5) | 2641 (25.1) | 1992 (23.4) |
| $46 119–60 409 | 3152 (23.9) | 3530 (24.3) | 2533 (24.1) | 2156 (25.4) |
| ≥$60 410 | 2849 (21.6) | 3566 (24.5) | 2782 (26.5) | 2300 (27.1) |
| Unknown | 525 (4.0) | 558 (3.8) | 400 (3.8) | 387 (4.6) |
| Percent of adults with less than high school education§ | ||||
| 0–18.5 | 3458 (26.3) | 3945 (27.1) | 2943 (28.0) | 2433 (28.6) |
| 18.6–25.2 | 3008 (22.8) | 3356 (23.1) | 2566 (24.4) | 2132 (25.1) |
| 25.3–32.5 | 3106 (23.6) | 3364 (23.1) | 2450 (23.3) | 1979 (23.3) |
| 32.5–100 | 3075 (23.3) | 3318 (22.8) | 2154 (20.5) | 1571 (18.5) |
| Unknown | 525 (4.0) | 558 (3.8) | 400 (3.8) | 387 (4.6) |
| Rural status | ||||
| Nonrural | 4401 (33.4) | 2261 (15.5) | 619 (5.9) | 251 (3.0) |
| Rural | 8771 (66.6) | 12 280 (84.5) | 9894 (94.1) | 8251 (97.0) |
*
Excluding registries added in 2000. There were statistically significant differences in all clinical and demographic variables across years (ie, P < .001 for all comparisons by χ2 test for heterogeneity), so P values are not shown in table. SEER = Surveillance, Epidemiology, and End Results database; WHO = World Health Organization.
†
Clinical tumor stage from Clinical Extension variable in SEER.
‡
WHO grade from SEER. WHO grade 1–2 correlates with Gleason score 2–7 tumors in 1992–2002 and Gleason score 2–6 tumors in 2003–2005.
§
Determined by average zip code level information according to 2000 United States census data.