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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
   Design Measurement Factors Confounding   Survey Up  
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