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This study conducted a national random phone survey using RDDs, with 1057 cases gathered in 4 cohorts. The data was regionally weighted and seasonally adjusted to ensure accuracy. The methodology used a 95% confidence level with a 3% confidence interval.
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Random Phone Survey RDDs Used National Sample Regionally Weighted 1057 Cases Gathered in 4 Cohorts (Seasonal Adjusted) 95% Confidence Level 3% + - Confidence Interval METHODOLOGY