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Table 3 Results of linear regression of variables of interest on time taken to complete procedure (log-transformed)

From: Usefulness of a visual aid in achieving optimal positioning for spinal anesthesia: a randomized trial

Variable & category

Unadjusted

Adjusteda

Coefficient (95% CI)

p-value

Coefficient (95% CI)

p-value

Instruction

 Verbal

ref

 

ref

 

 Verbal and visual

−0.5 (−0.8 to −0.2)

0.006

−0.4 (−0.8 to −0.1)

0.022

BMI per unit (kg/m2)

0.05 (0.02 to 0.09)

0.003

0.05 (0.01 to 0.08)

0.007

Bony landmark

 Clear

ref

 

ref

 

 Unclear

0.5 (0.1 to 1.0)

0.015

0.42 (−0.0 to 0.9)

0.067

  1. aEstimates also adjusted for age and gender