Table 1. Comparing the mean measurements of specified anatomical landmarks acquired from the original CT data, edited STL files, and the scaled down 3D printed liver model.
| Paired comparisons | Paired samples statistics (mm) | Paired samples test (paired differences) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Total mean | Standard deviation | Mean difference (mm) | 95% confidence interval of the difference | t | df | P | |||
| Lower (mm) | Upper (mm) | ||||||||
| Pair 1 | |||||||||
| CT data | 18.28 | 9.31 | 2.65 | –3.65 | 8.95 | 0.93 | 11 | 0.37 | |
| STL files | 15.63 | 8.06 | |||||||
| Pair 2 | |||||||||
| CT data | 18.28 | 9.31 | 3.81 | –1.93 | 9.55 | 1.46 | 11 | 0.17 | |
| 3D liver model | 14.47 | 7.71 | |||||||
| Pair 3 | |||||||||
| STL files | 15.63 | 8.06 | 1.16 | –0.31 | 2.63 | 1.74 | 11 | 0.11 | |
| 3D liver model | 14.47 | 7.71 | |||||||
3D, three-dimensional; CT, computed tomography; STL, standard tessellation language; t, t-statistic; df, degrees of freedom; P, P value.