Table 3 Validity Assessment (Score out of 8)
From: Association of Down's syndrome and water fluoride level: a systematic review of the evidence
Author | Prospective | Study | Fluoride | Confounding | Control for | Blinding | Baseline | Follow- | Score |
|---|---|---|---|---|---|---|---|---|---|
| Â | Â | Design | Measurement | Factors | Confounding | Â | Survey | Up | Â |
Erickson (1976) | 0 | 1/2 | 0 | 1 | 1 | 0 | 0 | 1 | 3.5 |
Erickson (1980) | 0 | 1/2 | 0 | 1 | 1 | 0 | 0 | 1 | 3.5 |
Needleman (1974) | 0 | 1/2 | 0 | 1/4 | 0 | 0 | 0 | 1 | 1.8 |
Rapaport (1963) | 0 | 1/2 | 0 | 1/4 | 0 | 0 | 0 | 1 | 1.8 |
Rapaport (1957) | 0 | 1/2 | 0 | 1/4 | 0 | 0 | 0 | 1 | 1.8 |
Berry (1958) | 0 | 1/2 | 0 | 0 | 0 | 0 | 0 | 1 | 1.5 |