Table 5

Factors that may affect success of placement using multivariate analysis

Factor Odds ratio of success: failure (95% CI)
Route lumbarv caudal8.12 (3.17 to 20.8)
Grade of operator:
 Consultant vother0.09 (0.01 to 0.72)
 Senior registrarv other0.10 (0.01 to 0.81)
Body mass index >30 v <300.28 (0.12 to 0.65)