Figure 2

The most commonly used analgesic agents during the different sedation periods. *Differences between fentanyl and sufentanil in a phase (χ² test, P < 0.05). The values were tested with the χ² test (P < 0.05) and multiple differences with the Bonferroni–Holm multiple test procedure. (Fentanyl: less than 24 hours versus 24–72 hours versus more than 72 hours versus weaning, all P < 0.01. Sufentanil: less than 24 hours versus 24–72 hours; less than 24 hours versus more than 72 hours; 24–72 hours versus more than 72 hours and 24–72 hours versus weaning, all P = 0.01; less than 24 hours versus weaning, P = 0.04; more than 72 hours versus weaning, P = 0.55.)