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. 2007 Jul-Sep;11(3):273–302.

Module 5: Grasping and Clipping

Proficiency = 148.6876 − 2e-04 Total time − 7e-04 No of lost clips−2e-04 No of movements of right instrument − 0.1511 Total path length of clipper in cm − 0.1518 Total path length of grasper in cm − 6e-04 Relevant path length clipper in cm

Variables Measured and Criterion Percentile Values
Variable 10 25 50 75 90
Total time 125.4 109.5 101 83 70.6
No of lost clips 2 2 1 1 0.6
Total no of clipping attempts 11 11 10 10 9.6
No of movements of right instrument 66 58.5 53 43 35.6
No of movements of left instrument 82.2 74 64 51 45.4
Total path length of right instrument cm 222.2 207.3 185.6 174.7 170.4
Total path length of left instrument cm 267.1 260.9 232.2 211.8 174.7
Total path length of clipper cm 244 219.1 206 169.5 157.1
Total path length of grasper cm 261.4 249.5 232.2 189.8 181.6
Relevant path length right instrument cm 215.9 202.3 177.3 165.8 161.7
Relevant path length left instrument cm 258.9 252.5 221.1 200.7 166.2
Relevant path length clipper cm 234.9 212.8 200.1 161.6 148.7
Relevant path length grasper cm 255.1 241.1 215.5 181.6 172.4
Accuracy rate applied clips 81.8 81.8 90 90 94
Ideal path length of clipper cm 92.96 99.75 108.5 124.2 132.2
Ideal path length of grasper cm 105.6 106.7 111.4 113.5 115.5
Economy of movement right instrument 50.92 56.6 60.4 62.5 69.8
Economy of movement left instrument 40.62 44.25 54.1 56.65 63.38
Economy of movement clipper 46.92 54.5 60.2 67.15 75.38
Economy of movement grasper 44.6 46.9 54.1 58.85 61.52
Ave speed of right instrument movement cm sec 2.46 2.65 2.8 3.1 3.28
Ave speed of left instrument movement cm sec 2.9 3.025 3.15 3.425 3.6
Proficiency score 74.53 77.34 85.67 90.62 95.67

Means ± Standard Deviations for Each Variable
Variable −1.5 −1 0 +1 +1.5

Total time 61.47 74.01 99.14 124.3 136.8
No of lost clips 0.152 0.53 1.286 2.042 2.42
Total no of clipping attempts 9.152 9.53 10.29 11.04 11.42
No of movements of right instrument 31.36 38.34 52.29 66.24 73.21
No of movements of left instrument 37.80 46.20 63 79.80 88.20
Total path length of right instrument cm 153.2 166.7 193.8 221.0 234.5
Total path length of left instrument cm 160.9 183.1 227.5 272.0 294.2
Total path length of clipper cm 137.6 158.1 199.2 240.3 260.8
Total path length of grasper cm 166.5 185.1 222.2 259.3 277.8
Relevant path length right instrument cm 145.1 158.8 186.1 213.5 227.2
Relevant path length left instrument cm 150.7 173.2 218.3 263.3 285.8
Relevant path length clipper cm 130.2 150.6 191.6 232.6 253.0
Relevant path length grasper cm 155.9 174.9 212.8 250.7 269.7
Accuracy rate applied clips 77.83 81.19 87.91 94.7 98.0
Ideal path length of clipper cm 81.94 91.92 111.9 131.9 141.8
Ideal path length of grasper cm 103.5 105.8 110.4 115.0 117.3
Economy of movement right instrument 45.94 50.92 60.87 70.82 75.8
Economy of movement left instrument 35.04 40.80 52.31 63.83 69.59
Economy of movement clipper 39.78 46.57 60.14 73.72 80.50
Economy of movement grasper 41.35 45.25 53.04 60.84 64.74
Ave speed of right instrument movement cm sec 2.333 2.512 2.871 3.231 3.41
Ave speed of left instrument movement cm sec 2.72 2.886 3.217 3.548 3.713
Proficiency score 69.76 74.75 84.73 94.71 99.70