Table 1:
Characteristics of the Medicare cohort on active surveillance stratified by receipt of multiparametric MRI (mpMRI)
| No mpMRI (N=8178) |
mpMRI (N=1289) |
P value1 | |
|---|---|---|---|
| Age at diagnosis (%) | <0.001 | ||
| 66–69 | 1664 (20) | 422 (33) | |
| 70–74 | 2661 (33) | 497 (39) | |
| 75–79 | 2155 (26) | 267 (21) | |
| 80 and older | 1698 (21) | 103 (7) | |
| Race (%) | <0.001 | ||
| White | 6861 (84) | 1119 (87) | |
| Black | 788 (10) | 76 (6) | |
| Other | 529 (6) | 94 (7) | |
| Marital Status (%) | <0.001 | ||
| Married | 4196 (51) | 771 (60) | |
| Not married | 1191 (15) | 171 (13) | |
| Unknown | 2791 (34) | 347 (27) | |
| Comorbidity (%) | <0.001 | ||
| 0 | 4721 (58) | 892 (69) | |
| 1 | 1941 (24) | 246 (19) | |
| 2 or more | 1516 (18) | 151 (12) | |
| Gleason score (%) | 0.002 | ||
| 3+3 or less | 6184 (76) | 1027 (80) | |
| 3+4 | 1994 (24) | 262 (20) | |
| Education level in the ZIP code of residence (%) | <0.001 | ||
| Low (<75% with high school education) | 882 (11) | 92 (7) | |
| High(>75% with high school education) | 7296 (89) | 1197 (93) | |
| County of residence population (%) | <0.001 | ||
| 1,000,000 or more | 4420 (54) | 861 (66) | |
| 250,000– 999,999 | 1378 (17) | 214 (17) | |
| Less than 250,000 | 2380 (29) | 214 (17) | |
| Median household income in ZIP code of residence, $ (%) | <0.001 | ||
| $60,000 or less | 4221 (52) | 422 (33) | |
| $60,001 or more | 3957 (48) | 867 (67) | |
| U.S. geographic region (%) | <0.001 | ||
| Northeast | 1322 (16) | 366 (28) | |
| South | 2060 (25) | 170 (14) | |
| Central | 1608 (20) | 120 (9) | |
| West | 3188 (39) | 633 (49) | |
| Year of Diagnosis (%)1 | <0.001 | ||
| 2008 | 1346 (17) | 165 (13) | |
| 2009 | 1382 (17) | 205 (16) | |
| 2010 | 1457 (18) | 199 (15) | |
| 2011 | 1536 (19) | 243 (19) | |
| 2012 | 1212 (14) | 233 (18) | |
| 2013 | 1245 (15) | 244 (19) |
1.
Due to the requirement of 2 years claims data follow up, rates of AS in the later study years should not be taken as a true denominator.