Patient-Controlled Intravenous Analgesia for Advanced Cancer Patients with Pain: A Retrospective Series Study

Table 2

NRS scores of the two groups at different times in the three groups.

NRS	Hydromorphone	Sufentanil	Oxycodone
T1	5.0 ± 1.1	4.9 ± 1.0	5.3 ± 1.1
T2	2.3 ± 0.8	2.0 ± 1.0	2.2 ± 0.7
T3	1.9 ± 0.7	1.7 ± 0.7	2.0 ± 0.6

T1: before PCIA; T2: at 4 hours after PCIA; T3: at the discontinuation of PCIA.