| ultrasound-assisted group | conventional puncture group | P-value |
---|---|---|---|
The overall proportion of success rate(n), % | 65(90.3%) | 56(77.8%) | 0.080 |
Rate difference, %(95% CI) | 12.5(0.7, 24.3) | – |  |
The overall time to cannulation(s) | 45.5(36, 96.25) | 94.0(56, 171) | 0.00 |
The time to cannulation at the first attempt(s) | 41.0(35, 53.75) | 60(45, 83) | 0.00 |
Overall puncture numbers | 1(1, 2) | 2(1, 3) | 0.002 |
Overall numbers of needle redirections | 3(1, 7) | 7(3, 13) | 0.001 |
Needle redirections at the first attempt | 2(1, 5) | 3(2, 6) | 0.027 |
The width of saphenous veins (mm) | 1.485Â +Â 0.318 | 1.543Â +Â 0.396 | 0.375 |
The depth of saphenous veins (mm) | 3.622Â +Â 1.408 | 3.605Â +Â 1.421 | 0.949 |
Complication (n), % | 3(4.27%) | 2(2.78%) | 0.999 |