Figure 2. The proportion of patients with moderate-to- severe pain at two time points (B, E) and at any time during three time periods (A, C, D) of the analgesia phase for the remifentanil (n = 72) and morphine (n = 78) groups. Measurement times (see also Figure 1): titration period (A), end of titration (B), transition period (C), open-label period (D), and end of open-label period (E).