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| Set1 OR95%CI | Set2 OR95%CI | Set3 OR95%CI | Set4 OR95%CI | Total OR95%CI | |
| In-experiencedobservers | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 |
| Experienced observers | 3.70 95%CI 1.87∼7.29 | 1.54 95% CI 0.77-3.11 | 0.72 95%CI 0.26–1.99 | 0.81 95% CI 0.30-2.17 | 1.77 95%CI 1.20-2.60 |
| p | <0.001 | 0.11 | 0.26 | 0.34 | 0.002 |
