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Worker Health Charts

Work Organization Characteristics (NHIS 2015) Charts
National Health Interview Survey (NHIS 2015)

Work Organization charts are based on data from respondents to the 2015 NHIS Occupational Health Supplement (NHIS-OHS) that were employed in the week prior to interview. The NHIS is a survey that collects data on a broad range of health topics through personal household interviews. Supplemental questions specific to occupational health were included in 2015. These charts include workers’ responses to questions related to the following work organization characteristics: Frequent Night Work, Non-Standard Work Arrangement (Independent Contractor or Freelance, Temporary Agency or Subcontractor), Shift Work (Any Alternative Shift), and Supervisory Responsibility.

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Unadjusted Prevalence of Work Organization Characteristics (NHIS 2015) Among Workers (NHIS-OHS)

Source: National Health Interview Survey (NHIS 2015)
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Unadjusted Prevalence of Work Organization Characteristics (NHIS 2015) Among Workers (NHIS-OHS)

Work Organization Characteristics (NHIS 2015)Estimated Population N (Annual Average)Estimated Population N with Condition (Annual Average)Unadjusted Prevalence (%) (a)95% LCL for Unadjusted Prevalence (c)95% UCL for Unadjusted Prevalence (d)Adjusted Prevalence (%) (a,b)95% LCL for Adjusted Prevalence (c)95% UCL for Adjusted Prevalence (d)
Frequent Night Work145,575,00010,834,0007.446.898.04N/AN/AN/A
Non-Standard Work Arrangement- Independent Contractor or Freelance145,791,00014,573,00010.009.3810.6511.2610.5112.05
Non-Standard Work Arrangement- Temporary Agency or Subcontractor145,791,0004,131,0002.832.503.212.792.453.17
Shift Work (Any Alternative Shift)145,794,00038,793,00026.6125.6827.56N/AN/AN/A
Supervisory Responsibility145,891,00047,734,00032.7231.7733.6831.4530.4932.42

Estimates are based on a sample of US adults rather than the entire population. Comparisons between unadjusted or adjusted prevalence rates for different groups should take into account the 95% confidence limits
Estimates adjusted for age, sex, and race using the projected 2000 U.S. population as the standard population.
LCL is the Lower Confidence Limit.
UCL is the Upper Confidence Limit.
Data not displayed, likely due to insufficient sample size.

Data Source

National Health Interview Survey (NHIS 2015)
National Health Interview Survey (NHIS 2015)

The National Health Interview Survey (NHIS) is an annual, in-person health survey and the principal source of information about the health of the civilian, non-institutionalized, household population of the United States. The survey is conducted by the National Center for Health Statistics, part of the Centers for Disease Control and Prevention. The NHIS sample is designed and weighted to produce national estimates. NIOSH uses data from the NHIS to estimate the prevalence of various health conditions and health behaviors among US workers. The charts available here are based on NHIS data from the 2015 Occupational Health Supplement. See the supplemental questions included in the Worker Health Charts (

v2.1 - Nov 2020