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| Needle insertion angle along linear path | The actual puncture path (%) | P value | |
|---|---|---|---|
| Non-linear | Linear path | ||
| 80°–90° (n=43) | 3 (7.0) | 40 (93.0) | <0.01 |
| 70°–80° (n=49) | 39 (79.6) | 10 (20.4) | |
