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Table 2 Comparisons of success rates, rescue rates and durations of NGI successful at the first attempt

From: A preinstalled nasopharyngeal airway in the right nasal passageway to facilitate nasogastric intubation in anesthetized and intubated patients: a prospective randomized controlled trial

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

  1. ARR absolute risk reduction, RRR relative risk reduction, CI confidence interval, NGI nasogastric intubation
  2. aNGI with an NPA in the right nasal passageway
  3. bNGI through the right nostril