การสุ่มกลุ่มตัวอย่าง

Randomized allocation:

Cancer patient who had pain will be approached to determine interest in participation. Inform consent will be obtained from patients who agreed to participate in the study. This study use block randomization, with block size of four will be used. The allocation sequence will be generated by computer.The allocation ratio is 1:1. Using STATA software

Based on the obtained schedule, the number of sealed envelopes, which are equal to the required blocks, will be prepared and labeled. Each envelope contains the corresponding sealed allocation cards that will allocate treatments to patients. The people, who prepare the randomized scheme, will not involve in the trial. The allocation schedule will be concealed until the end of trial.

The researcher need to know what type of approach to be provided to a certain patient, however, the sequence list will keep confidentially and not exposed to outcome assessors.