Table 1.
Characteristics of the study population
| Characteristics | Treatment | P-value* | |||
|---|---|---|---|---|---|
| All (n=1306) | Conservative management (n=508) | Surgery (n=195) | Radiation (n=603) | ||
| Age, years (%) | <0.001 | ||||
| 65-69 | 362 (28 ) | 78 (15 ) | 113 (58 ) | 171 (28 ) | |
| 70-74 | 447 (34 ) | 135 (27 ) | 68 (35 ) | 244 (40 ) | |
| 75+ | 497 (38 ) | 295 (58 ) | 14 (7 ) | 188 (31 ) | |
| Race/ethnicity (%) | 0.99 | ||||
| White | 916 (70 ) | 356 (70 ) | 136 (70 ) | 424 (70 ) | |
| Non-white | 390 (30 ) | 152 (30 ) | 59 (30 ) | 179 (30 ) | |
| Marital Status (%) | <0.001 | ||||
| Married | 871 (67 ) | 273 (54 ) | 153 (78 ) | 445 (74 ) | |
| Not Married | 435 (33 ) | 235 (46 ) | 42 (22 ) | 158 (26 ) | |
| Comorbidity (%) | 0.001 | ||||
| 0 | 199 (15 ) | 58 (11 ) | 34 (17 ) | 107 (18 ) | |
| 1 | 323 (25 ) | 134 (26 ) | 58 (30 ) | 131 (22 ) | |
| 2 | 295 (23 ) | 102 (20 ) | 46 (24 ) | 147 (24 ) | |
| 3 or more | 489 (37 ) | 214 (42 ) | 57 (29 ) | 218 (36 ) | |
| Education (%)** | <0.001 | ||||
| Less than a high school education | 321 (25 ) | 153 (31 ) | 34 (18 ) | 134 (23 ) | |
| At least a high school education | 966 (75 ) | 348 (69 ) | 158 (82 ) | 460 (77 ) | |
| Household income, $, (%)** | <0.001 | ||||
| Less than 20,000 | 333 (30 ) | 149 (34 ) | 42 (27 ) | 142 (28 ) | |
| 20,000-39,000 | 387 (35 ) | 169 (39 ) | 44 (28 ) | 174 (35 ) | |
| 40,000 or more | 376 (34 ) | 118 (27 ) | 70 (45 ) | 188 (37 ) | |
| Geographic region (%) | <0.001 | ||||
| Northeast | 250 (19 ) | 79 (16 ) | 28 (14 ) | 143 (24 ) | |
| South | 199 (15 ) | 72 (14 ) | 26 (13 ) | 101 (17 ) | |
| Central | 240 (18 ) | 108 (21 ) | 44 (23 ) | 88 (15 ) | |
| West | 617 (47 ) | 249 (49 ) | 97 (50 ) | 271 (45 ) | |
| Tumor grade (%) | 0.14 | ||||
| Well/moderately differentiated | 809 (62 ) | 312 (61 ) | 110 (56 ) | 387 (64 ) | |
| Poorly/undifferentiated | 497 (38 ) | 196 (39 ) | 85 (44 ) | 216 (36 ) | |
| Disease risk (%) | <0.001 | ||||
| Lower | 633 (48 ) | 271 (53 ) | 62 (32 ) | 300 (50 ) | |
| Higher | 673 (52 ) | 237 (47 ) | 133 (68 ) | 303 (50 ) | |
| Year of diagnosis (%)*** | 0.02 | ||||
| 1998 | 42 (3 ) | 15 (3 ) | -- | 21 (3 ) | |
| 1999 | 161 (12 ) | 67 (13 ) | 28 (14 ) | 66 (11 ) | |
| 2000 | 138 (11 ) | 49 (10 ) | 18 (9 ) | 71 (12 ) | |
| 2001 | 147 (11 ) | 39 (8 ) | 31 (16 ) | 77 (13 ) | |
| 2002 | 119 (9 ) | 46 (9 ) | 14 (7 ) | 59 (10 ) | |
| 2003 | 90 (7 ) | 33 (7 ) | -- | 50 (8 ) | |
| 2004 | 79 (6 ) | 33 (7 ) | -- | 39 (6 ) | |
| 2005 | 70 (5 ) | 27 (5 ) | -- | 35 (6 ) | |
| 2006 | 58 (4 ) | 25 (5 ) | -- | 28 (5 ) | |
| 2007 | 101 (8 ) | 48 (9 ) | 20 (10 ) | 33 (5 ) | |
| 2008 | 124 (9 ) | 53 (10 ) | 18 (9 ) | 53 (9 ) | |
| 2009 | 177 (14 ) | 73 (14 ) | 33 (17 ) | 71 (12 ) | |
*
P-values generated from chi-square tests
**
Values imputed for 19 patients missing education information and 210 patients missing household income information
***
Exact numbers not shown in order to be compliant with SEER-Medicare guidelines, which prohibits displaying cell counts <11
Percentages might not sum to 100 because of rounding