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Table 4 Success rate of the first attempt in the ultrasound-assisted group versus conventional puncture group

From: A randomized controlled trial of ultrasound-assisted technique versus conventional puncture method for saphenous venous cannulations in children with congenital heart disease

  ultrasound-assisted
group
Conventional puncture group P-value
Total(n) 72 72  
Success on first attempt (n) 45 27 0.017
%(95% CI) 61.4(50.7, 73.3) 38.6(26.3, 48.7)  
Rate difference, %(95% CI) 24.5(8.6, 40.4)  
Relative risk, (95% CI) 1.547(1.072, 2.235) 0.640(0.436, 0.939)  
Cyanosis(n) 36 36  
Success on first attempt (n) 24 12 0.035
%(95% CI) 66.7(51.3, 82.1) 33.3(17.9, 48.7)  
Rate difference, %(95% CI) 33.3(11.6, 55.1)  
Relative risk, (95% CI) 1.714(1.042, 2.820) 0.545(0.293, 1.017)  
Acyanosis(n) 36 36  
Success on first attempt (n) 21 15 0.194
%(95% CI) 57.6(42.2, 74.4) 42.4(25.6, 57.8)  
Rate difference, %(95% CI) 16.7(−6.1, 39.4)  
Relative risk, (95% CI) 1.413(0.823, 2.428) 0.716(0.432, 1.187)  
  1. CI confidence interval