Total mean score was converted into the percentage of the maximum score for each of the instruments, the ICC for AMSTAR against OQAQ (total score of 9 items, excluding item 10) was 0.87 (95% CI: 0.76, 0.93), that is, the results of AMSTAR were highly convergence with the results of OQAQ. Besides, both overall scores were converted into the percentage of maximum score.