Table 2 Study quality
Criteria | Yes | |
|---|---|---|
1 | Was the research question or objective in this paper clearly stated? | 48/48 |
2 | Was the study population clearly specified and defined? | 48/48 |
3 | Was the participation rate of eligible persons at least 50%? | 17/48 |
4 | Were all the subjects selected or recruited from the same or similar populations (including the same time period)? Were inclusion and exclusion criteria for being in the study pre-specified and applied uniformly to all participants | 48/48 |
5 | Was the study population similar to the national population? | 14/48 |
6 | Was the sampling methods specified and appropriate? | 48/48 |