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Table 1 Logistic regression table with coefficients and confidence intervals for each propofol concentrations*.

From: Brain function assessment in different conscious states

       95% CI
Predictor Coef SE Coef Z P Odds Ratio Lower Upper
Logit 1: (1.2µg/mL / 1.6 µg/mL) Constant BIS scores -1.892 0.021 0.167 0.002 -11.30 9.86 0.000 0.000 1.02 1.02 1.03
Logit 2: (0.8 µg/mL / 1.6 µg/mL) Constant BIS scores -7.875 0.098 0.191 0.002 -41.24 41.98 0.000 0.000 1.10 1.10 1.11
Logit 2: (0.4 µg/mL / 1.6 µg/mL) Constant BIS scores -18.485 0.215 0.289 0.003 -64.04 65.06 0.000 0.000 1.24 1.23 1.25
Logit 2: (0 µg/mL / 1.6 µg/mL) Constant BIS scores -20.329 0.226 0.397 0.004 -51.15 51.04 0.000 0.000 1.25 1.24 1.26
  1. *Propofol dosage 1.6 µg/mL has been chosen as the reference level. The Coef. (coefficient) column shows the change in the logit of the given dosage compared to dosage 1.6 µg/mL when BIS values increse by 1 unit. BIS, bispectral index; CI, confidence interval; SE, standard error.