Randomization
The participants were divided into the intervention and control groups using block randomization, with 4 and 6 block sizes and an allocation ratio of 1:1; within each of these “blocks,” the conditions occurred in a random order. Random sequence generation was conducted by a person not involved in sampling and data collection. Opaque, sealed envelopes were used for allocation concealment. The envelopes were revealed sequentially as the participants entered the study.