Randomization
Forty-nine students were randomly assigned to the intervention and control groups. Each student was randomly assigned a code. Then, the codes were placed in a box. The first code drawn from the box conferred assignment to the intervention group, while the second code represented allocation to the control group. This process continued until all students had been selected, at which time 25 students were in the intervention group and 24 in the control group. Subsequently, the intervention and control groups were matched in terms of their demographic variables. The unit of analysis was the same as the unit of assignment (intervention or control).