Table 3.
Subgroup analysis of patients on anticoagulants
| Anticoagulation use or not | PAI-N (n = 45) | PAI-U (n = 4) | P value | IAI-N (n = 32) | IAI-U (n = 4) | P value | Control-N (n = 38) | Control-U (n = 4) | P value | P* | P** |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Drainage volume (mL) | 324.7 ± 182.1 | 327.5 ± 296.0 | 0.98 | 299.1 ± 172.7 | 352.5 ± 148.9 | 0.56 | 732.4 ± 289.6 | 645.0 ± 305.1 | 0.57 | 0.00, | 0.21, |
| 0.90, | 0.90, | ||||||||||
| 0.00, | 0.18, | ||||||||||
| 0.00 | 0.15 | ||||||||||
| Hb drop (g/L) | 23.2 ± 8.8 | 23.5 ± 15.5 | 0.96 | 23.9 ± 10.0 | 28.0 ± 9.8 | 0.44 | 32.4 ± 14.0 | 42.0 ± 18.16 | 0.21 | 0.00, | 0.24, |
| 0.80, | 0.68, | ||||||||||
| 0.00, | 0.11, | ||||||||||
| 0.00 | 0.22 | ||||||||||
| Estimated blood loss (mL) | 860.6 ± 343.2 | 1009.7 ± 150.8 | 0.40 | 861.4 ± 457.27 | 1336.1 ± 337.5 | 0.06 | 1486.1 ± 1002.3 | 1496.5 ± 787.4 | 0.98 | 0.00, | 0.43, |
| 0.99 | 0.40, | ||||||||||
| 0.00 | 0.60, | ||||||||||
| 0.00 | 0.97 |
Values are expressed as a mean ± standard deviation
PAI peri-articular injection, IAI intra-articular injection, U anticoagulation used, N anticoagulation not used
P*: Differences (Three groups, PAI-N vs. IAI-N, PAI-N vs. Control-N, IAI-N vs. Control-N) among subgroups of PAI-N, IAI-N, and Control-N
P**: Differences (three groups, PAI-U vs. IAI-U, PAI-U vs. Control-U, IAI-U vs. Control-U) among subgroups of PAI-U, IAI-U, and Control-U