Control | Observation | Test value | P-value | |
---|---|---|---|---|
Theoretical knowledge | 87.3 ± 5.5 | 93.7 ± 5.0 | t = 3.40 | 0.002 |
Practical skill | 86.4 ± 4.7 | 91.6 ± 5.1 | t = 2.88 | 0.009 |
Error rate | 0.92% (409/44652) | 0.52% (263/50445) | χ2 = 52.57 | 0.000 |
Device damage | 0.61% (132/21780) | 0.40% (89/22044) | χ2 = 8.94 | 0.003 |