Table 2. Description of population-based cohort of patients with urothelial bladder cancer.
| Variables | Total | 1993–2002 | 2003–2012 | P value1 |
|---|---|---|---|---|
| N | 220,405 | 69,314 | 151,091 | |
| Age, year, mean ± SD | 70.84±12.08 | 70.16±12.16 | 71.15±12.03 | <0.001 |
| <35 | 1,204 (0.55) | 483 (0.70) | 721 (0.48) | <0.001 |
| 35–44 | 4,099 (1.86) | 1,653 (2.38) | 2,446 (1.62) | |
| 45–54 | 16,526 (7.50) | 5,649 (8.15) | 10,877 (7.20) | |
| 55–64 | 40,606 (18.42) | 12,214 (17.62) | 28,392 (18.79) | |
| 65–74 | 64,413 (29.22) | 21,490 (31.00) | 42,923 (28.41) | |
| ≥75 | 93,557 (42.45) | 27,825 (40.14) | 65,732 (43.50) | |
| Race, n (%) | <0.001 | |||
| White | 198,035 (89.85) | 62,334 (89.93) | 135,701 (89.81) | |
| Black | 11,875 (5.39) | 3,780 (5.45) | 8,095 (5.36) | |
| Other | 9,056 (4.11) | 2,965 (4.28) | 6,091 (4.03) | |
| Unknown | 1,439 (0.65) | 235 (0.34) | 1,204 (0.80) | |
| Sex, n (%) | <0.001 | |||
| Male | 167,036 (75.79) | 51,868 (74.83) | 115,168 (76.22) | |
| Female | 53,369 (24.21) | 17,446 (25.17) | 35,923 (23.78) | |
| Grade, n (%) | <0.001 | |||
| Grade I | 31,428 (14.26) | 11,867 (17.12) | 19,561 (12.95) | |
| Grade II | 64,916 (29.45) | 25,870 (37.32) | 39,046 (25.84) | |
| Grade III | 49,409 (22.42) | 19,576 (28.24) | 29,833 (19.75) | |
| Grade IV | 46,654 (21.17) | 7,560 (10.91) | 39,094 (25.87) | |
| Unknown | 27,998 (12.70) | 4,441 (6.41) | 23,557 (15.59) | |
| Histology, n (%) | <0.001 | |||
| Localized | 171,208 (77.68) | 53,523 (77.22) | 117,685 (77.89) | |
| Regional | 39,607 (17.97) | 12,491 (18.02) | 27,116 (17.95) | |
| Distant | 6,663 (3.02) | 1,915 (2.76) | 4,748 (3.14) | |
| Unstaged | 2,927 (1.33) | 1,385 (2.00) | 1,542 (1.02) | |
| T stage, n (%) | <0.001 | |||
| <T2 | 172,161 (78.11) | 53,611 (77.35) | 118,550 (78.46) | |
| ≥T2 | 44,841 (20.34) | 14,295 (20.62) | 30,546 (20.22) | |
| Tx | 3,403 (1.54) | 1,408 (2.03) | 1,995 (1.32) | |
| Median household income2, n (%) | <0.001 | |||
| Low | 122,036 (55.37) | 36,389 (52.50) | 85,647 (56.69) | |
| High | 98,341 (44.62) | 32,915 (47.49) | 65,426 (43.30) | |
| Unknown | 28 (0.01) | 10 (0.01) | 18 (0.01) | |
| Marital status, n (%) | <0.001 | |||
| Married | 134,142 (60.86) | 43,745 (63.11) | 90,397 (59.83) | |
| Previous married | 51,436 (23.34) | 16,411 (23.68) | 35,025 (23.18) | |
| Never married | 20,786 (9.43) | 6,150 (8.87) | 14,636 (9.69) | |
| Unknown | 14,041 (6.37) | 3,008 (4.34) | 11,033 (7.30) | |
| With previous primary, n (%) | <0.001 | |||
| No | 166,112 (75.37) | 54,558 (78.71) | 111,554 (73.83) | |
| Yes | 54,293 (24.63) | 14,756 (21.29) | 39,537 (26.17) | |
| Cancer-directed surgery, n (%) | <0.001 | |||
| No3 | 12,067 (5.47) | 3,502 (5.05) | 8,565 (5.67) | |
| Yes | 207,845 (94.30) | 65,711 (94.80) | 142,134 (94.07) | |
| Unknown | 493 (0.22) | 101 (0.15) | 392 (0.26) | |
1, comparison between 1993–2002 and 2003–2012; 2, median household income: defined by earnings above the median of the median household income in this sample; 3, including “no surgical procedure”, “needle, or aspiration biopsy” or “Non-cancer directed surgery”. Grade I = well differentiated; Grade II = moderately differentiated; Grade III = poorly differentiated; Grade IV = undifferentiated; anaplastic. UBC, urothelial bladder cancer; SD, standard deviation.