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Demographics of patient cohort.
| Variable | n (%) | |
|---|---|---|
| median (range) | ||
| Number of subjects | 1437 | |
| Male | 654 (46%) | |
| Age at implant | 59.9 years (18–95) | |
| Race | ||
| White | 1238 (86%) | |
| Black | 114 (8%) | |
| Asian | 30 (2%) | |
| Other | 55 (4%) | |
| Numbers of tests per patient | 15 (2–30) | |
| Interval between surgery and test for post-operative tests | 2.3 years (0.1–27) | |
| Year of implant | ||
| 1985–1990 | 2 (0.1%) | |
| 1991–1995 | 38 (3%) | |
| 1996–2000 | 150 (10%) | |
| 2001–2005 | 307 (21%) | |
| 2006–2010 | 408 (28%) | |
| 2011–2015 | 356 (25%) | |
| 2016–2019 | 176 (12%) |
