Ethical approval to conduct the study was obtained from the University of Sydney Human Research Ethics Committee. This study was designed as a two-armed cluster randomised controlled trial. The experimental group received office ergonomic training, and the control group was asked to conduct “business as usual” (no ergonomic training); 3 units were randomly assigned to the experimental group, and 3 were assigned to the control group using a random number table. The random number was set at 6. The minimum value was set at 1 (experimental group) and maximum value at 2 (control group). The researchers were aware of the allocation of the groups. Respondents were aware of the study, but they did not know whether they belonged to the experimental or control group. The study flow chart is presented in