| Catheter to vein ratio | Venous thrombosis | Univariate analysis | ||||
No (n=1085) | Yes (n=13) | Total (n=1098) | RR | 95% CI | Sig* | ||
n (%) | n (%) | n (%) | |||||
All participants | ≤33% | 563 (98.43) | 9 (1.57) | 572 (100) | 1.00 | ||
≥34% | 522 (99.24) | 4 (0.76) | 526 (100) | 0.48 | 0.150 to 1.560 | 0.224 | |
Total | 1085 (98.82) | 13 (1.18) | 1098 (100) | ||||
≤45% | 1021 (98.93) | 11 (1.07) | 1032 (100) | 1.00 | |||
≥46% | 64 (96.97) | 2 (3.03) | 66 (100) | 2.84 | 0.643 to 12.563 | 0.168 | |
Total | 1085 (98.82) | 13 (1.18) | 1098 (100) |
| No (n=479) | Yes (n=8) | Total (n=487) | ||||
n (%) | n (%) | n (%) | |||||
Cancer diagnosis | ≤33% | 210 (97.67) | 5 (2.33) | 215 (100) | 1.00 | ||
≥34% | 269 (98.90) | 3 (1.10) | 272 (100) | 0.47 | 0.115 to 1.962 | 0.303 | |
Total | 479 (98.36) | 8 (1.64) | 487 (100) | ||||
≤45% | 445 (98.67) | 6 (1.33) | 451 (100) | 1.00 | |||
≥46% | 34 (94.44) | 2 (5.56) | 36 (100) | 4.18 | 0.874 to 19.950 | 0.073 | |
Total | 479 (98.36) | 8 (1.64) | 487 (100) |
No (n=39) | Yes (n=0) | Total (n=39) | | ||||
n (%) | n (%) | n (%) | |||||
Haematological cancer diagnosis | ≤33% | 19 (100) | 0 (100) | 19 (100) | 1.00 | ||
≥34% | 20 (100) | 0 (100) | 20 (100) | – | – | – | |
Total | 39 (100) | 0 (100) | 39 (100) | ||||
≤45% | 38 (100) | 0 (100) | 38 (100) | 1.00 | |||
≥46% | 1 (100) | 0 (100) | 1 (100) | – | – | – | |
Total | 39 (100) | 0 (100) | 39 (100) |
No (n=16) | Yes (n=3) | Total (n=19) | |||||
n (%) | n (%) | n (%) | |||||
Oncological cancer diagnosis | ≤33% | 6 (75) | 2 (25) | 8 (100) | 1.00 | ||
≥34% | 10 (90.91) | 1 (9.09) | 11 (100) | 0.36 | 0.039 to 3.351 | 0.372 | |
Total | 16 (84.21) | 3 (15.79) | 19 (100) | ||||
≤45% | 15 (88.24) | 2 (11.76) | 17 (100) | 1.00 | |||
≥46% | 1 (50) | 1 (50) | 2 (100) | 4.25 | 0.635 to 28.456 | 0.136 | |
Total | 16 (84.21) | 3 (15.79) | 19 (100) |
No (n=606) | Yes (n=5) | Total (n=611) | |||||
n (%) | n (%) | n (%) | |||||
Infection and other diagnoses† | ≤33% | 353 (98.88) | 4 (1.12) | 357 (100) | 1.00 | ||
≥34% | 253 (99.61) | 1 (0.39) | 254 (100) | 0.35 | 0.040 to 3.125 | 0.348 | |
Total | 606 (99.18) | 5 (0.82) | 611 (100) | ||||
≤45% | 576 (99.14) | 5 (0.86) | 581 (100) | 1.00 | |||
≥46% | 30 (100) | 0 (0) | 30 (100) | – | – | – | |
Total | 606 (99.18) | 5 (0.82) | 611 (100) |
*Based on log binomial generalised linear model.
†Infection requiring intravenous antibiotics or other non-cancer diagnosis with difficult venous access requiring patient controlled analgesia, intravenous fluid, etc; one participant had missing external length.
PICC, peripherally inserted central catheter; RR, relative risk.