| AIALANGA | Language of the MEC ACASI Interview Instrument | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDEDUC2 | What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDEDUC3 | What is the highest grade or level of school {you have/SP has} completed or the highest degree {you have/s/he has} received? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDFMSIZ | Total number of people in the Family | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHHSIZ | Total number of people in the Household | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHHSZA | Number of children aged 5 years or younger in the household | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHHSZB | Number of children aged 6-17 years old in the household | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHHSZE | Number of adults aged 60 years or older in the household | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHRAGZ | HH reference person's age in years | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHREDZ | HH reference person's education level | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHRGND | HH reference person's gender | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHRMAZ | HH reference person's marital status | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDHSEDZ | HH reference person's spouse's education level | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDMARTL | Marital status | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMDYRUSZ | Length of time the participant has been in the US. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMQ135 | {Were you/Was {SP}} born in the United States or a United States territory | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMQADFC | Did {you/SP} ever serve in a foreign country during a time of armed conflict or on a humanitarian or peace-keeping mission? (This would include National Guard or reserve or active duty monitoring or conducting peace keeping operations in Bosnia and Kosovo, in the Sinai between Egypt and Israel, or in response to the 2004 tsunami or Haiti in 2010.) | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| DMQMILIZ | {Have you/Has SP} ever served on active duty in the U.S. Armed Forces, military Reserves, or National Guard? (Active duty does not include training for the Reserves or National Guard, but does include activation, for service in the U.S. or in a foreign country, in support of military or humanitarian operations.) | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| FIAINTRP | Was an interpreter used to conduct the Family interview? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| FIALANG | Language of the Family Interview Instrument | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| FIAPROXY | Was a Proxy respondent used in conducting the Family Interview? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| INDFMIN2 | Total family income (reported as a range value in dollars) | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| INDFMPIR | A ratio of family income to poverty guidelines. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| INDHHIN2 | Total household income (reported as a range value in dollars) | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| MIAINTRP | Was an interpreter used to conduct the MEC CAPI interview? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| MIALANG | Language of the MEC CAPI Interview Instrument | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| MIAPROXY | Was a Proxy respondent used in conducting the MEC CAPI Interview? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIAGENDR | Gender of the participant. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDAGEMN | Age in months of the participant at the time of screening. Reported for persons aged 24 months or younger at the time of exam (or screening if not examined). | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDAGEYR | Age in years of the participant at the time of screening. Individuals 80 and over are topcoded at 80 years of age. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDEXAGM | Age in months of the participant at the time of examination. Reported for persons aged 19 years or younger at the time of examination. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDEXMON | Six month time period when the examination was performed - two categories: November 1 through April 30, May 1 through October 31. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDEXPRG | Pregnancy status for females between 20 and 44 years of age at the time of MEC exam. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDRETH1 | Recode of reported race and Hispanic origin information | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDRETH3 | Recode of reported race and Hispanic origin information, with Non-Hispanic Asian Category | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| RIDSTATR | Interview and examination status of the participant. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| SDDSRVYR | Data release cycle | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| SEQN | Respondent sequence number. | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| SIAINTRP | Was an interpreter used to conduct the Sample Person (SP) interview? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| SIALANG | Language of the Sample Person Interview Instrument | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |
| SIAPROXY | Was a Proxy respondent used in conducting the Sample Person (SP) interview? | DEMO_K_R | Demographic Variables | 2019 | 2020 | Demographics | RDC Only |