Fig. 2. Bispectral Index values at various time points of anesthesia. Data are mean ± SD. #P < 0.001 for BIS® or Narcotrend groups vs. standard practice group. *P < 0.05 for BIS® group vs. standard practice group. No significant differences between Narcotrend and BIS® groups (analysis of variance with Student-Newman-Keuls test for multiple comparisons).