Table 1.
Rates of good placement and dangerous placement of the TPS inserted by the chief surgeon
| Subgroup | In total | P (Chi-square test) | ||||
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | ||
| Rate of good placement % | ||||||
| 83.3 | 76.6 | 83.3 | 86.7 | 81.1 | 82.2 | 0.440 |
| Rate of dangerous placement% | ||||||
| 6.7 | 16.6 | 13.3 | 3.3 | 5.4 | 9.1 | 0.304 |
The pedicle screws inserted by the chief surgeon were divided into 5 subgroups of 30 screws in chronological order. For the rate of good placement and dangerous placement, there was no significant difference among the subgroups using the Chi-square test