Table 1.
Descriptive statistics of the total sample and the analyzed subsample
| Variable | Total sample | Subsample (patients needing outpatient LMWH thromboprophylaxis) |
|---|---|---|
| Number of patients | 1495 (100.0%) | 1315 (100.0%) |
| Age (years)* | 67.9 | 67.6 |
| Gender | ||
| Female | 901 (60.3%) | 780 (59.3%) |
| Male | 594 (39.7%) | 535 (40.7%) |
| Surgery | ||
| Knee arthroplasty | 739 (49.4%) | 659 (50.1%) |
| Hip arthroplasty | 756 (50.6%) | 656 (49.9%) |
| Rehabilitation after acute hospital stay | ||
| Stationary rehabilitation | 1118 (74.8%) | 958 (72.9%) |
| Outpatient rehabilitation | 354 (23.7%) | 341 (25.9%) |
| Without any rehabilitation | 16 (1.1%) | 16 (1.2%) |
| Information not collected | 7 (0.4%) | |
| Linking | ||
| Yes | 843 (56.4%) | 826 (62.8%) |
| No | 645 (43.2%) | 489 (37.2%) |
| Information not collected | 7 (0.4%) | |
| Duration of linking between acute hospitalization and start of inpatient/outpatient rehabilitation (days)† | 3.9 (0–15) | 4.2 (0–16) |
| Duration of outpatient thromboprophylaxis (days)† | 8.9 (0–31) | 10.9 (1–32) |
| Duration of acute hospital stay (days)† | 11.8 (6–20) | 11.3 (6–17) |
| Time between surgery and interview date (days)† | 41.3 (34–59) | 41.0 (34–56) |
| Recommendation for the duration of thromboprophylaxis (days)† | 33.4 (21–42) | 33.3 (21–42) |
| Postoperative complications | ||
| No complications | 1143 (76.5%) | 1123 (85.4%) |
| Thromboembolic complications | 9 (0.6%) | 9 (0.7%) |
| Other complications (not specified) | 184 (12.3%) | 183 (13.9%) |
| No information available | 159 (10.6%) | |
| Number of different drugs taken per day (not including LMWH) | ||
| None | 140 (9.4%) | 138 (10.5%) |
| Up to 2 | 382 (25.5%) | 376 (28.6%) |
| 3–5 | 510 (34.1%) | 505 (38.4%) |
| 6–10 | 264 (17.7%) | 259 (19.7%) |
| > 10 | 38 (2.5%) | 37 (2.8%) |
| Information not collected | 161 (10.8%) | |
| Self-injections during outpatient thromboprophylaxis | ||
| Yes | 745 (49.9%) | 745 (56.7%) |
| No | 570 (38.1%) | 570 (43.3%) |
| Information not collected | 180 (12.0%) | |
| Chronic diseases (more than one answer possible) | ||
| None | 543 (36.3%) | 543 (41.3%) |
| Hypertension | 366 (24.5%) | 366 (27.8%) |
| Diabetes (both types) | 138 (9.2%) | 138 (10.5%) |
| Rheumatism | 38 (2.5%) | 38 (2.9%) |
| Other | 294 (19.7%) | 294 (22.4%) |
| Information not collected | 180 (12.0%) | |
| Living circumstances | ||
| Living alone | 294 (19.7%) | 294 (22.4%) |
| Living with spouse/life partner | 891 (59.6%) | 891 (67.7%) |
| Living with children | 92 (6.2%) | 92 (7.0%) |
| Other circumstances | 38 (2.5%) | 38 (2.9%) |
| Information not collected | 180 (12.0%) | |
| Highest achieved education grade | ||
| Without any formal apprenticeship | 172 (11.5%) | 172 (13.1%) |
| Completed apprenticeship | 898 (60.1%) | 898 (68.3%) |
| University degree | 179 (12.0%) | 179 (13.6%) |
| Other qualifications | 66 (4.4%) | 66 (5.0%) |
| Information not collected | 180 (12.0%) | |
Some patients with no experience of LMWH thromboprophylaxis (warfarin or direct thrombin inhibitors were used) or without obvious outpatient prophylaxis (because their defined pathway did not include outpatient prophylaxis) were not asked all interview questions; for this reason, some data are not available for these patients; *values are expressed as means; †values are expressed as means, with 95% confidence intervals in parentheses; NA = nonadherence; LMWH = low-molecular-weight heparin.