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. 2006 Jun 15;3(3):A94.

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This flowchart shows the sampling design and response rate of the New York City Health and Nutrition Examination Survey, 2004. First, 144 segments were randomly selected from approximately 20,000 segments in New York City. Then, 4026 households were approached (for a response rate of 84% [3388/4026]). 3388 completed the eligibility interview; 638 did not. 3047 participants were identified (for a response rate of 66% [1999/3047]). 1999 participants were examined; 1048 refused. The overall response rate was 55% (84% x 66%). — Sample design and participation rates of the New York City Health and Nutrition Examination Survey, 2004.