Table 4.
Quality assessment of the included studies
| Items | Yes, n (%) | No, n (%) | Unclear, n (%) |
|---|---|---|---|
| 1. Is the target population clearly defined? | 43 (97.7) | 1 (2.27) | 0 |
| 2. Was either of the following ascertainment methods used [must be one or the other]? (1) probability sampling, or (2) entire population surveyed | 41 (93.2) | 3 (6.82) | 0 |
| 3. Is the response rate >70% | 26 (59.1) | 18 (40.9) | 0 |
| 4. Are nonresponders clearly described? | 2 (4.5) | 42 (95.5) | 0 |
| 5. Is the sample representative of the target population? | 42 (95.5) | 2 (4.5) | 0 |
| 6. Were data collection methods standardized? | 44 (100) | 0 | 0 |
| 7. Were validated criteria used to assess for the presence/absence of disease? | 44 (100) | 0 | 0 |
| 8. Are the estimates of prevalence given with confidence intervals and in detail by subgroup (if applicable)? | 9 (20.5) | 35 (79.5) | 0 |