Table 3

Outcome measures (based on average from two videotape reviewers)

Pit-crew training
(n=10)
Standard training
(n=10)
Mean difference (95% CI)P value*
Device deployment, mean (95% CI)
 Flow fraction in minute preceding first mechanical CC0.76 (0.73 to 0.79)0.77 (0.73 to 0.82)−0.01 (− 0.06 to 0.03)0.572
 Time to deploy back plate (s)3.80 (2.83 to 4.76)3.82 (2.62 to 5.02)−0.03 (−1.46 to 1.41)0.971
 Time to deploy upper part of device (s)9.99 (8.84 to 11.14)9.67 (8.02 to 11.32)0.32 (−1.55 to 2.19)0.724
 Total pause for mechanical device deployment (s)14.33 (12.62 to 16.03)13.56 (11.05 to 16.06)0.77 (−2.04 to 3.58)0.572
 Time from device arrival to first mechanical CC (s), median (IQR)55.25 (51.63 to 75.24)60.43 (52.70 to 73.99)0.912
Compliance with manufacturer’s guidelines (out of 8), median (IQR)8 (8–8)8 (8–8)0.739
CPR quality
 Flow fraction, mean (95% CI)
  Whole episode0.94 (0.93 to 0.95)0.94 (0.93 to 0.95)0.00 (−0.01 to 0.01)0.790
  Predevice deployment0.90 (0.89 to 0.92)0.90 (0.88 to 0.91)0.01 (−0.01 to 0.03)0.538
  Postdevice deployment0.97 (0.96 to 0.98)0.97 (0.96 to 0.98)0.00 (−0.01 to 0.01)0.681
 Number of pauses>5 s, median (IQR)2.00 (1.75 to 3.00)2.50 (1.00 to 4.13)0.853
 Number of shocks delivered, median (IQR)2 (2– 2)2 (2– 2)1.000
 Shocks delivered appropriately, median (IQR)2 (2–2)2 (2–2)1.000
 Perishock pause (s), median (IQR)
  Preshock pause0.00 (0.00–0.00)0.00 (0.00– 0.00)1.000
  Postshock pause0.00 (0.00– 0.00)0.00 (0.00– 0.00)1.000
Non-technical skills, TEAM tool
 TEAM tool, component score (out of 44)38.0 (35.7 to 40.3)37.6 (34.8 to 40.4)0.40 (−2.94 to 3.74)0.804
 TEAM tool, global (overall) score (out of 10)8.1 (7.2 to 8.9)7.9 (7.3 to 8.6)0.15 (−0.87 to 1.17)0.760
Training delivery
 Duration of training, mean (95% CI) 49.0 (44.0 to 54.0)45.3 (40.5 to 50.1)3.1 (−2.7 to 10.1)0.244
  • *By independent t-test unless stated.

  • †By Mann-Whitney U test.

  • ‡Data point measured directly during training intervention, so not based on assessment from two reviewers.

  • CC, chest compression; CPR, cardiopulmonary resuscitation; TEAM, Team Emergency Assessment Measure.