Table 1.
Weighted descriptive characteristics of patients older than 18 years with systemic lupus erythematosus, NIS (January 2003 through December 2011)
| Variable | All Patients | VTE | No VTE | P |
|---|---|---|---|---|
| N = 299 595 | n = 9175 | n = 290 420 | ||
| Age, mean (SD), y | 50.00 (25.00) | 48.00 (25.00) | 51.00 (25.00) | <0.001 |
| Sex, n (%) | ||||
| Female | 266 969 (89) | 7769 (85) | 259 200 (89) | … |
| Male | 32 626 (11) | 1406 (15) | 31 220 (11) | … |
| Race, n (%) | <0.001 | |||
| White | 132 649 (54) | 3670 (48) | 128 979 (54) | … |
| African American | 71 151 (29) | 2706 (35) | 68 445 (29) | … |
| Hispanic | 29 582 (12) | 948 (12) | 28 634 (12) | … |
| Asian | 5258 (2) | 127 (2) | 5131 (2) | … |
| Native American | 1498 (1) | 46 (1) | 1452 (1) | … |
| Other | 5699 (2) | 187 (2) | 5512 (2) | … |
| No. of comorbidities, mean (SD) | 3.00 (2.00) | 4.00 (3.00) | 3.00 (2.00) | <0.001 |
| Hospital location, n (%) | <.001 | |||
| Urban | 269 880 (91) | 8436 (92) | 261 444 (91) | … |
| Rural | 29 715 (9) | 739 (8) | 28 976 (9) | … |
| Teaching status, n (%) | <.001 | |||
| Nonteaching | 149 853 (50) | 4225 (46) | 145 628 (50) | … |
| Teaching | 149 742 (50) | 4950 (54) | 144 792 (50) | … |
Abbreviation: NIS, Nationwide Inpatient Sample; VTE, venous thromboembolism.