Prevalence of Underweight Among Adults Aged 20 and Over: United States, 1960–1962 Through 2013–2014
by Cheryl D. Fryar, M.S.P.H., Margaret D. Carroll, M.S.P.H., and Cynthia L. Ogden, Ph.D., Division of Health and Nutrition Examination Surveys
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Poor nutrition or underlying health conditions can result in adults being underweight. Results from the 2013–2014 National Health and Nutrition Examination Survey (NHANES), using measured heights and weights, indicate that an estimated 1.4% of U.S. adults aged 20 and over are underweight. Body mass index (BMI), expressed as weight in kilograms divided by height in meters squared (kg/m2), is commonly used to classify underweight (BMI less than 18.5) among adults aged 20 and over.
The age-adjusted and age-specific prevalence of underweight among adults aged 20 and over from 1988–1994 through 2013–2014 is shown in Table 1. Because surveys before 1988 did not include persons over age 74, Table 2 shows age-adjusted and age-specific prevalence estimates of underweight for adults aged 20–74 for all survey periods dating back to 1960.
NHANES, conducted by the National Center for Health Statistics, is a multistage probability sample of the civilian noninstitutionalized population of the United States. A household interview and a physical examination are conducted for each survey participant. During the physical examination, conducted in a mobile examination center, height and weight are measured as part of a more comprehensive set of body measurements. These measurements are taken by trained health technicians, using standardized measuring procedures and equipment. Observations for pregnant women and for persons missing a valid height or weight measurement were not included in the data analysis.
For additional information visit the NHANES methods page.
Tables
| Survey period | Sample size (n) | Percent (standard error) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total1 | Age | Sex1 | |||||||||||
| 20–39 | 40–59 | 60 and over | Men | Women | |||||||||
| 1988–1994 | 16,235 | 2.3 | (0.2) | 3.0 | (0.4) | 1.7 | (0.3) | 2.3 | (0.2) | 1.1 | (0.2) | 3.5 | (0.3) |
| 1999–2000 | 4,117 | 2.0 | (0.2) | 2.9 | (0.4) | 1.3 | (0.2) | 1.4 | (0.4) | 1.1 | (0.2) | 2.7 | (0.5) |
| 2001–2002 | 4,413 | 1.9 | (0.2) | 2.9 | (0.5) | 0.9 | (0.2) | 3.0 | (0.3) | 1.0 | (0.3) | 2.7 | (0.3) |
| 2003–2004 | 4,431 | 1.7 | (0.2) | 2.8 | (0.3) | *1.0 | (0.4) | 0.8 | (0.2) | 1.4 | (0.3) | 2.0 | (0.4) |
| 2005–2006 | 4,356 | 1.9 | (0.3) | 2.4 | (0.6) | 1.4 | (0.4) | 1.6 | (0.3) | 1.2 | (0.4) | 2.5 | (0.4) |
| 2007–2008 | 5,550 | 1.6 | (0.3) | 1.9 | (0.5) | *1.5 | (0.5) | 1.1 | (0.2) | 1.0 | (0.3) | 2.2 | (0.4) |
| 2009–2010 | 5,926 | 1.8 | (0.3) | 2.0 | (0.3) | 2.1 | (0.5) | 1.3 | (0.2) | 1.0 | (0.2) | 2.6 | (0.5) |
| 2011–2012 | 5,181 | 1.7 | (0.2) | 2.5 | (0.3) | 0.9 | (0.2) | 1.6 | (0.4) | 0.7 | (0.1) | 2.6 | (0.4) |
| 2013–2014 | 5,455 | 1.4 | (0.2) | 1.9 | (0.4) | *0.8 | (0.3) | 1.6 | (0.4) | 1.3 | (0.3) | 1.6 | (0.2) |
* Estimate has a relative standard error greater than 30% but less than 40% and should be used with caution because it does not meet standards of reliability or precision.
1Age-adjusted by the direct method to the year 2000 U.S. Census Bureau estimates using the age groups 20–39, 40–59, and 60 and over. Pregnant females were excluded from the analysis.
NOTE: Underweight is body mass index less than 18.5 kg/m2.
SOURCE: NCHS, National Health and Nutrition Examination Survey.
| Survey period | Sample size (n) | Percent (standard error) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total1 | Age | Sex1 | |||||||||||
| 20–39 | 40–59 | 60 – 74 | Men | Women | |||||||||
| 1960–1962 | 6,126 | 4.0 | (0.2) | 5.7 | (0.4) | 2.3 | (0.3) | 3.7 | (0.6) | 2.2 | (0.2) | 5.7 | (0.4) |
| 1971–1974 | 12,911 | 3.6 | (0.2) | 4.9 | (0.3) | 2.2 | (0.3) | 3.8 | (0.4) | 2.4 | (0.3) | 4.8 | (0.3) |
| 1976–1980 | 11,765 | 3.0 | (0.1) | 4.2 | (0.3) | 1.9 | (0.3) | 2.7 | (0.4) | 1.6 | (0.2) | 4.4 | (0.3) |
| 1988–1994 | 14,319 | 2.3 | (0.2) | 3.0 | (0.4) | 1.7 | (0.3) | 1.9 | (0.3) | 1.1 | (0.2) | 3.5 | (0.3) |
| 1999–2000 | 3,603 | 2.0 | (0.2) | 2.9 | (0.4) | 1.3 | (0.2) | 1.1 | (0.2) | 1.2 | (0.2) | 2.7 | (0.5) |
| 2001–2002 | 3,916 | 1.8 | (0.2) | 2.9 | (0.5) | 0.9 | (0.2) | *1.4 | (0.4) | 1.0 | (0.3) | 2.6 | (0.4) |
| 2003–2004 | 3,756 | 1.7 | (0.2) | 2.8 | (0.3) | *1.0 | (0.4) | *0.7 | (0.3) | 1.4 | (0.3) | 2.1 | (0.4) |
| 2005–2006 | 3,835 | 1.8 | (0.3) | 2.4 | (0.6) | 1.4 | (0.4) | *1.1 | (0.5) | 1.3 | (0.4) | 2.4 | (0.5) |
| 2007–2008 | 4,876 | 1.6 | (0.3) | 1.9 | (0.5) | *1.5 | (0.5) | 0.9 | (0.2) | *0.9 | (0.3) | 2.3 | (0.4) |
| 2009–2010 | 5,279 | 1.9 | (0.3) | 2.0 | (0.3) | 2.1 | (0.5) | 1.2 | (0.3) | 1.0 | (0.3) | 2.7 | (0.5) |
| 2011–2012 | 4,674 | 1.7 | (0.2) | 2.5 | (0.3) | 0.9 | (0.2) | *1.2 | (0.5) | 0.7 | (0.1) | 2.6 | (0.4) |
| 2013–2014 | 4,940 | 1.4 | (0.2) | 1.9 | (0.4) | *0.8 | (0.3) | 1.7 | (0.5) | 1.4 | (0.3) | 1.5 | (0.3) |
* Estimate has a relative standard error greater than 30% but less than 40% and should be used with caution because it does not meet standards of reliability or precision.
1Age-adjusted by the direct method to the year 2000 U.S. Census Bureau estimates using the age groups 20–39, 40–59, and 60–74. Pregnant females were excluded from the analysis.
NOTES: Underweight is body mass index less than 18.5 kg/m2. National Health Examination Survey 1960–1962 and National Health and Nutrition Examination Surveys 1971–1974 and 1976–1980 did not include individuals over age 74.
SOURCES: NCHS, National Health Examination Survey, 1960–1962; and National Health and Nutrition Examination Surveys 1971–1974, 1976–1980, 1988–1994, and 1999–2014.
This Health E-Stat supersedes the earlier version below:
• Prevalence of Underweight Among Adults Aged 20 and Over: United States, 1960–1962 Through 2011–2012.