Table 1.
Summary of descriptive statistics for subjects receiving total knee arthroplasty, HCUP-California, 2007-2010 (N = 133,603).
| Characteristics | Frequency (%) |
|---|---|
| Year of admission | |
| 2007 | 31,615 (23.7%) |
| 2008 | 32,535 (24.3%) |
| 2009 | 33,746 (25.3%) |
| 2010 | 35,707 (26.7%) |
| Age (y) | |
| 50-54 | 9113 (6.8%) |
| 55-59 | 15,667 (11.7%) |
| 60-64 | 20,717 (15.5%) |
| 65-69 | 24,539 (18.4%) |
| 70-74 | 23,437 (17.5%) |
| 75-79 | 21,222 (15.9%) |
| Over 80 | 18,908 (14.2%) |
| Insurance type | |
| Medicaid | 3498 (2.6%) |
| All other insurance | 130,099 (97.4%) |
| Sex | |
| Female | 81,951 (62.3%) |
| Male | 49,683 (37.7%) |
| Ethnic group | |
| White | 95,715 (74.8%) |
| Hispanic | 17,565 (13.7%) |
| Black | 5950 (4.6%) |
| Asian | 4923 (3.8%) |
| All others | 3805 (3.1%) |
| Comorbidity depression | |
| Yes | 9786 (7.3%) |
| No | 123,817 (92.7%) |