What is the sample size for a particular data item, questionnaire section, examination component, or laboratory analyte?
For any particular questionnaire section, examination component or laboratory data file you will only find records for survey participants that were eligible. For example, suppose 6,000 people were eligible for an examination in the MEC and only 5,000 were eligible for the muscular strength component due to age restrictions. Of the 5,000 suppose only 4,500 participated in the examination; the other 500 either refused or did not have enough time to participate in the exam. The data file would have 5,000 records with 500 records having missing data. For further details refer to the “frequency” counts document for each of the data files.
Related Questions
- Next to the name of each questionnaire section, laboratory component, or exam component on the NHANES 2005-2006 data page there are links that appear as follows: [Data, Docs, Procedures]. What are these links for?
- Next to the name of each questionnaire section, laboratory component, or exam component on the NHANES 2007-2008 data page there are links that appear as follows: [Data, Docs, Procedures]. What are these links for?
- What is the sample size for a particular data item, questionnaire section, examination component, or laboratory analyte?
