Outcomes | Group NPAa (n = 53) | Group Ob (n = 55) | Statistical test results |
---|---|---|---|
Success rate at the first attempt, % (n/N) | 83.0 (44/53) | 47.3 (26/55) | P < 0.001 (Pearson χ2 test) ARR = 35.7, 95% CI = 19.1 to 52.4 RRR = 67.8, 95% CI = 38.6 to 83.1 |
Success rate in accumulative attempts (two attempts maximum), % (n/N) | 88.7 (47/53) | 63.6 (35/55) | P = 0.002 (Pearson χ2 test) ARR = 25.0, 95% CI = 9.7 to 40.4 RRR = 68.9, 95% CI = 28.6 to 86.4 |
Rescue rate for the failed cases by the method in the other group, % (n/N) | 16.7 (1/6) | 75.0 (15/20) | P = 0.018 (Fisher exact test) ARR = 58.3, 95% CI = 23.0 to 93.7 RRR = 70.0, 95% CI = 30.6 to 87.0 |
Total failure rate after 4 attempts, % (n/N) | 9.4 (5/53) | 9.1 (5/55) | P > 0.99 (Fisher exact test) ARR = − 0.3, 95% CI = − 11.3 to 10.6 RRR = − 3.8, 95% CI = − 238.0 to 68.1 |
Durations of successful NGI at the first attempt (s), mean (SD) | 56.3 (32.5) | 27.1 (8.6) | P < 0.001 (Student t test) Mean difference = 29.2, 95% CI = 20.0 to 38.4 |