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Table 2 Cronbach’s alpha reliability coefficients for the 10 performance measures

From: Assessing colonoscopic inspection skill using a virtual withdrawal simulation: a preliminary validation of performance metrics

Performance measure

α

1. Percentage of polyp markers found

.80

2. Number of polyp markers found per minute

.84

3. Percentage of mucosal surface illuminated for 0.5 s or more

.90

4. Percentage of polyp markers illuminated for 2.5 s or more but not identified

.57

5. Withdrawal time (min)

.79

6. Linear distance travelled by colonoscope (m)

.94

7. Total tip distance travelled (m)

.87

8. Tip distance travelled due to up/down control movement (m)

.90

9. Tip distance travelled due to left/right control movement (m)

.91

10. Tip distance travelled due to axial rotation (m)

.89