Sample Design Tables

Att_5a_Sample Design Tables 2021-22_201029.docx

National Health and Nutrition Examination Survey

Sample Design Tables

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Attachment 5a


Sample Design Tables 2021-2022


There are two major sample design changes for the 2021-2022 NHANES from the 2019-2020 cycle. The first change is that we made each year’s sample nationally representative. This will eliminate the problem that occurred for the 2019-2020 cycle when we had to suspend the data collection in 2020 due to the pandemic. As the result, the data we did collect in 2019-2020 are not nationally representative, because we were unable to complete the collection for all the survey locations in the full two-year sample. This has profound implication in the utility of our data, and the mission it supports. Therefore, for 2021-2022, given the uncertainty of the pandemic status, we will select an annually, nationally representative sample for each year of the data collection. The second change is eliminating our oversample by race, Hispanic origin, and income. In 2021-22, within all selected households, anyone aged 0-19 years and 60 years and older will be eligible. In addition, one or two people aged 20-59, residing in the selected households, will be eligible as well. This elimination of oversampling allows every selected household to have at least one eligible sampled participant (SP), cutting down significantly on screener burden.


Table 1 shows the summary distribution by age for the examination targets in 2019-2020 and 2021-2022. For NHANES 2021-2022, there will be 12 sampling domains defined by gender and age. These domains represent the analytic subpopulations of interest. Table 2 shows the detailed sampling domains for NHANES 2021-2022 with expected total sampled persons, estimated exam response rates and expected number of exams for the 12 sampling domains presented. Attachment 5b contains the NHANES 2019-20 sample design as presented in the NHANES Protocol #2019-01.



Table 1: Examination Target Distribution by Age Category



Distribution

Age Category

2019-2020

2021-2022

0-5

16%

11%

6-11

12%

11%

12-19

12%

14%

20-39

19%

20%

40-59

19%

18%

60+

21%

27%




0-19

40%

35%

20+

60%

65%


Table 2: Detailed Sampling Domains, Expected Total Sampled Persons, Estimated Exam Response Rates and Expected Number of Exams by Sex and Age, 2021-2022


Sex

Age

Projected population average over years 2019-2022

Total Sample

Estimated exam response rate2

Target number of exams for 2021-2022

M

0-5 yrs.

12,633,263

1,051


52%


546



6-11 yrs.

12,461,586

1,036


50%


523



12-19 yrs.

16,944,665

1,409


51%


714



20-39 yrs.

44,314,630


2,211


41%


912



40-59 yrs.

40,223,196


2,007


41%


827



60+ yrs.

35,298,161


2,936


40%


1,186


F

0-5 yrs.

12,067,654


1,004


52%


522



6-11 yrs.

11,940,786


993


54%


532



12-19 yrs.

16,396,197


1,364


52%


702



20-39 yrs.

44,455,528


2,218


49%


1,087



40-59 yrs.

41,978,331


2,095


47%


982


 

60+ yrs.

41,718,611


3,470


42%


1,468


TOTAL

330,432,608

21,794

46%

10,000




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