Table 2. Baseline characteristics of respondents and non-respondents in the ALTERNATIVE survey cohort.
| Variable | Overall | Respondents* | Non-Respondents | D-Value± |
|---|---|---|---|---|
| (N = 12,737) | (N = 5,017) | (N = 7,720) | ||
| Age, years, mean (SD) | 62.7 (15.9) | 63.0 (14.5) | 62.5 (16.6) | 0.03 |
| Age group, years, n (%) | 0.11 | |||
| ≤54 | 3668 (28.8) | 1292 (25.8) | 2376 (30.8) | |
| 55–64 | 2759 (21.7) | 1178 (23.5) | 1581 (20.5) | |
| 65–74 | 3139 (24.6) | 1442 (28.7) | 1697 (22.0) | |
| 75–84 | 2283 (17.9) | 860 (17.1) | 1423 (18.4) | |
| ≥ 85 | 888 (7.0) | 245 (4.9) | 643 (8.3) | |
| Female, n (%) | 6230 (48.9) | 2478 (49.4) | 3752 (48.6) | 0.01 |
| Race, n (%) | 0.11 | |||
| White/European | 8881 (69.7) | 3815 (76.0) | 5066 (65.6) | |
| Black/African American | 1784 (14.0) | 553 (11.0) | 1231 (15.9) | |
| Asian/Pacific Islander | 657 (5.2) | 190 (3.8) | 467 (6.0) | |
| Other | 63 (0.5) | 27 (0.5) | 36 (0.5) | |
| Unknown | 1352 (10.6) | 432 (8.6) | 920 (11.9) | |
| Hispanic ethnicity, n (%) | 0.07 | |||
| Hispanic | 2227 (17.5) | 702 (14.0) | 1525 (19.8) | |
| Non-Hispanic/Unknown | 10,510 (82.5) | 4315 (86.0) | 6195 (80.2) | |
| VTE encounter type, n (%) | 0.04 | |||
| Outpatient | 2427 (19.1) | 1006 (20.1) | 1421 (18.4) | |
| Emergency Department | 5998 (47.1) | 2415 (48.1) | 3583 (46.4) | |
| Inpatient | 4312 (33.9) | 1596 (31.8) | 2716 (35.2) | |
| VTE type, n (%) | 0.05 | |||
| Pulmonary Embolism | 5818 (45.7) | 2387 (47.6) | 3431 (44.4) | |
| Lower Extremity Deep Vein Thrombosis | 5530 (43.4) | 2168 (43.2) | 3362 (43.5) | |
| Upper Extremity Deep Vein Thrombosis | 757 (5.9) | 234 (4.7) | 523 (6.8) | |
| Mesenteric Venous Thrombosis | 305 (2.4) | 111 (2.2) | 194 (2.5) | |
| Unknown VTE | 327 (2.6) | 117 (2.3) | 210 (2.7) | |
| Site, n (%) | 0.03 | |||
| KPNC | 6010 (47.2) | 2454 (48.9) | 3556 (46.1) | |
| KPSC | 6727 (52.8) | 2563 (51.1) | 4164 (53.9) | |
| Index year, n (%) | 0.12 | |||
| 2015 | 3354 (26.3) | 1453 (29.0) | 1901 (24.6) | |
| 2016 | 3736 (29.3) | 1702 (33.9) | 2034 (26.4) | |
| 2017 | 3930 (30.8) | 1333 (26.6) | 2597 (33.6) | |
| 2018 | 1717 (13.5) | 529 (10.5) | 1188 (15.4) |
*Includes 246 individuals who partially completed surveys.
±Values >0.2 are considered meaningfully different