Table 1.
Comparison of groups by procedure times
| Variable | Posteroanterior (n = 15) | Oblique (n = 14) | Mean difference (sec) | t-test | p-value |
|---|---|---|---|---|---|
| Procedure time (sec) | 176.9 ± 83.4 | 288.7 ± 170.5 | 111.8 | 2.22 | 0.03 |
| Needling time (sec) | 19.5 ± 8.6 | 66.6 ± 58.3 | 47.0 | 2.99 | 0.01 |
| Fluoroscopy time (sec) | |||||
| Mean± SD | 7.0 ± 3.8 | 5.2 ± 3.9 | 1.8 | 1.25 | 0.22 |
| Median difference | 4.0 | 6.5 | 2.5 | 2.46* | 0.01 |
| Body mass index (kg/m2) | 31.0 ± 12.2 | 31.5 ± 7.1 | - | - | > 0.5 |
Values are presented as mean±standard deviation (SD).
Comparison of the average times (procedure, needle, and fluoroscopy) between the 2 groups without adjusting for any other factors. The total procedure time, measured in seconds, is 111.8 seconds less for posteroanterior procedures, on average, than for oblique procedures. The difference in total procedure time between the 2 groups is statistically significant.
*
Z statistic, Wilcoxon test.