Task 1: How to Select the Correct Weights for NHANES II Analysis

To select the correct weights for NHANES II data, you need to first check all variables in your analysis and select the weight of the smallest analysis subpopulation.  Separate weights are provided for those who have completed the interview, MEC exam, or are part of one of the six subsamples. See the Table below for the correct weights for each component or subsample.

 

Appropriate Uses of the NHANES II Sampling Weights.
Sample weight Application
Medical history interview final weight, N2AH0288 Use only in conjunction with the sample interviewed at home, and only with items collected during the household interview
MEC Examined final weight, N2AH0282 Use only in conjunction with the sample examined at the MEC, and only with interview and examination items collected at the MEC
Oral glucose tolerance test final examined weight, N2AH0294 Use in conjunction with laboratory data requiring a fasting sample, such as the items from the oral glucose tolerance test
Lead final examined weight, N2AH0300 Use in conjunction with lead subsample and only in conjunction with items collected as part of that subsample
Carboxyhemoglobin final examined weight, N2AH0306 Use in conjunction with carboxyhemoglobin subsample and only in conjunction with items collected as part of that subsample
Bile acids final examined weight, N2AH0312 Use in conjunction with bile acids subsample and only in conjunction with items collected as part of that subsample
“Anemia” subsample final examined weight  (folate, vitamin B12, and differential leukocyte counts), N2LB0334 Use in conjunction with anemia subsample and only in conjunction with items collected as part of the anemia subsample
Serum ferritin final examined weight, N2LB0328 Use in conjunction with ferritin subsample and only in conjunction with items collected as part of that subsample

 

Examples

 

It is important to check all the variables in your analysis and use the weight of the smallest sample subpopulation. Otherwise you will not obtain estimates appropriately adjusted for survey non-response.

 

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