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Factors determining operation time of LC
| Factors | F value | P value |
| Use of IOUS | 6.524 | 0.011 |
| Operative indication | 1.071 | 0.370 |
| Presence of cholecystitis symptom | 2.381 | 0.123 |
| Surgeon (senior/junior) | 3.778 | 0.053 |
| Intraoperative cholangiography | 1.685 | 0.195 |
| LCG: G0/G1/G2/G3 | 5.148 | 0.002 |
| IOUS × Surgeon | 0.208 | 0.648 |
| IOUS × LCG | 0.359 | 0.782 |
| Surgeon × LCG | 0.424 | 0.736 |
