Sample Design Tables 2019-2020

Att_14a Sample Design Tables 2019-20 072518.docx

National Health and Nutrition Examination Survey

Sample Design Tables 2019-2020

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Attachment 14a


Sample Design Tables 2019-2020


The sample design selected for NHANES 2019-2020 is similar to the NHANES 2015-2018 with one exception. To increase operational efficiency, the new design will produce a nationally representative sample over the course of a two-year cycle instead of annually. Because of declining response rates, it has become difficult to reach the target number of examinations (5,000/year) with the current design. Changing to a two-year cycle will permit more days of field work and a great number of MEC appointments in each PSU which will result in more time to screen and recruit potential participants, and allow for more exam slots.



Table 1 shows the summary distribution by race/Hispanic origin/income and age for 2015-2018 and the planned distribution in 2019-2020. For NHANES 2019-2020, there will still be 87 sampling domains defined by race and Hispanic origin, gender, age, and, for the white/other domains, low income status (i.e., households in which the household income is below 185% of the poverty level). These domains represent the analytic subpopulations of interest. Table 2 shows the detailed sampling domains for NHANES with expected total sampled persons, estimated exam response rates and expected number of exams for the 87 sampling domains. Attachment A contains the current NHANES 2015-18 sample design as presented in the NHANES Protocol #2018-01.



Table 1: Examination Target Distribution by Race/Hispanic:

Origin/Income and Age Category



Distribution

Race/ethnicity/income

2015-2018

2019-2020

Black

25%

25%

Mexican/Hispanic

25%

25%

Other Low income

12%

12%

Other Non-low income

25%

25%

Asian

13%

13%



Distribution

Age Category

2015-2018

2019-2020

0-5

16%

16%

6-11

12%

12%

12-19

12%

12%

20-39

19%

19%

40-59

19%

19%

60+

21%

21%




0-19

40%

40%

20+

60%

60%


Table 2: Projected population size for 2019-2022, number of sampled persons, and projected response rates for NHANES 2019-2020 in 30 PSUs by sex, age, race/Hispanic origin, and income

Race Ethnicity

Income

Sex

Age

Projected population average over years 2019-20221

Total Sample

Estimated exam response rate2

Target number of exams for 2019-2020

Black

 

M&F

0-11 mos.

702,386

130

62%

79


1-2 yrs.

1,386,924

252

56%

143


3-5 yrs.

2,026,435

279

57%

160

M

6-11 yrs.

2,006,398

287

56%

160


12-19 yrs.

2,584,917

279

57%

160


20-39 yrs.

5,992,528

502

49%

246


40-49 yrs.

2,295,065

256

48%

123


50-59 yrs.

2,349,826

244

51%

123


60+ yrs.

3,283,261

507

49%

246

F

6-11 yrs.

1,945,644

256

62%

160


12-19 yrs.

2,582,021

264

61%

160


20-39 yrs.

6,707,346

470

52%

246


40-49 yrs.

2,804,662

221

56%

123


50-59 yrs.

2,812,709

226

55%

123

 

60+ yrs.

4,499,819

497

50%

246

Total non-Hispanic Black

43,979,942

4,671

54%

2,500

Hispanic

 

M&F

0-11 mos.

1,080,951

199

62%

123


1-2 yrs.

2,145,096

242

62%

150


3-5 yrs.

3,156,692

268

56%

150

M

6-11 yrs.

3,235,852

261

58%

150


12-19 yrs.

4,276,739

251

60%

150


20-39 yrs.

10,325,422

531

46%

246


40-49 yrs.

4,282,980

274

45%

123


50-59 yrs.

3,287,883

256

48%

123


60+ yrs.

3,400,667

529

46%

246

F

6-11 yrs.

3,122,093

245

61%

150


12-19 yrs.

4,124,568

253

59%

150


20-39 yrs.

9,521,929

461

53%

246


40-49 yrs.

4,100,088

213

58%

123


50-59 yrs.

3,303,196

225

55%

123

 

60+ yrs.

4,132,941

486

51%

246

Total Hispanic


63,497,100

4,693

53%

2,500

Race Ethnicity

Income

Sex

Age

Projected population average over years 2019-20221

Total Sample

Estimated exam response rate2

Target number of exams for 2019-2020

Asian

 

M&F

0-11 mos.

298,790

55

51%

28


1-2 yrs.

593,720

107

45%

48


3-5 yrs.

880,552

160

41%

67

M

6-11 yrs.

851,126

154

43%

67


12-19 yrs.

1,108,621

203

42%

86


20-39 yrs.

3,333,060

431

37%

159


40-49 yrs.

1,466,201

221

36%

79


50-59 yrs.

1,203,629

221

35%

78


60+ yrs.

1,655,908

300

35%

105

F

6-11 yrs.

814,305

148

38%

56


12-19 yrs.

1,083,179

200

44%

87


20-39 yrs.

3,531,786

451

35%

159


40-49 yrs.

1,696,161

215

37%

79


50-59 yrs.

1,401,563

242

33%

79

 

60+ yrs.

2,138,563

389

31%

122

Total non-Hispanic, non-Black Asian

22,057,165

3,498

37%

1,300

White/Other Low Income

M&F

0-11 mos.

589,533

109

57%

61


1-2 yrs.

1,212,175

133

54%

72


3-5 yrs.

1,801,361

136

53%

72

M

6-11 yrs.

1,799,593

124

58%

72


12-19 yrs.

2,106,515

125

57%

72


20-29 yrs.

2,728,011

100

50%

51


30-39 yrs.

2,081,901

95

53%

51


40-49 yrs.

1,704,688

95

53%

51


50-59 yrs.

2,080,516

92

54%

51


60-69 yrs.

2,415,067

101

49%

51


70-79 yrs.

1,718,180

107

47%

51


80+ yrs.

1,055,762

117

43%

51

F

6-11 yrs.

1,701,029

116

62%

72


12-19 yrs.

2,226,543

125

57%

72


20-29 yrs.

3,602,179

87

58%

51


30-39 yrs.

2,865,649

83

60%

51


40-49 yrs.

2,177,716

85

59%

51


50-59 yrs.

2,344,394

86

58%

51

Race Ethnicity

Income

Sex

Age

Projected population average over years 2019-20221

Total Sample

Estimated exam response rate2

Target number of exams for 2019-2020

White/Other Low Income

F

60-69 yrs.

3,011,326

89

56%

51


70-79 yrs.

2,723,697

102

49%

51

 

80+ yrs.

2,272,283

131

38%

51

Total non-Hispanic White/Other Low Income

44,218,118

2,239

54%

1,200

Total

non-Hispanic White/Other Not Low Income

 

M&F

0-11 mos.

1,461,867

266

47%

127


1-2 yrs.

2,922,530

326

46%

149


3-5 yrs.

4,441,896

345

43%

149

M

6-11 yrs.

4,568,617

361

42%

149


12-19 yrs.

6,867,873

360

42%

149


20-29 yrs.

9,326,976

304

35%

105


30-39 yrs.

10,534,275

308

34%

105


40-49 yrs.

9,996,836

297

36%

105


50-59 yrs.

11,555,571

294

36%

105


60-69 yrs.

11,385,049

281

38%

105


70-79 yrs.

7,359,661

274

39%

105


80+ yrs.

3,024,606

354

30%

105

F

6-11 yrs.

4,357,716

342

44%

149


12-19 yrs.

6,379,885

357

42%

149


20-29 yrs.

8,386,306

234

45%

105


30-39 yrs.

9,841,720

240

44%

105


40-49 yrs.

9,665,823

255

42%

105


50-59 yrs.

11,672,017

271

39%

105


60-69 yrs.

11,801,476

244

43%

105


70-79 yrs.

7,638,799

308

34%

105

 

80+ yrs.

3,499,707

370

29%

105

Total non-Hispanic White/Other Not Low Income

156,689,207

6,388

39%

2,500



Total non-Hispanic White/Other




200,907,325



8,627



43%



3,700



TOTAL



330,441,531



21,488



47%



10,000

1 Civilian noninstitutionalized population in the 50 United States and the District of Columbia.

2 Unconditional response rates are the domain-level response rates (number of examined persons divided by the number of sampled persons) from the 2015-2016 experience, each adjusted downward by the overall screener response rate experienced in those years to result in conservative estimates.




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