Calculation of survey weights for this partial cycle is not possible due to incomplete data collection. Data collection was cancelled for the remaining 12 locations. The COVID-19 pandemic required suspension of NHANES 2019-2020 field operations in March 2020 after data were collected in 18 of the 30 survey locations in the 2019-2020 sample. Summary variables with test administration notes including instructions not understood or nonperformance due to a physical impairment were created for some tasks. Recordings of approximately 4% of participants with refusal and don’t know responses were evaluated to ensure the consistent application of response codes. Data Processing and EditingĮdits were made, as necessary, to ensure the completeness, consistency, and analytic usefulness of the data. Any differences in scores were adjudicated by a reviewer who completed MoCA certification and training.Īpproximately 5% of audio-recorded interviews were independently reviewed over the course of the data collection cycle to evaluate consistency in administration of instructions, to determine accuracy in scoring, and to examine differences in scoring by interviewers. Interviewers entered itemized scores and verbatim responses into an electronic scoring application and the scores of the two interviewers were compared. Scoring was usually conducted on the same day as the assessment. After each interview, two interviewers independently assigned points for each item in the assessment according to MoCA scoring criteria (MoCA Version 8.1). Tests were administered by four primary interviewers. Survey participants orally agreed to audio record the testing session before the administration of any questions or tasks. Interviewers closely followed the administration guidelines of the MoCA. Questions and tasks were administered at the mobile examination center (MEC), by trained interviewers, using the Computer-Assisted Personal Interview (CAPI) system during the MEC interview session. Interview Setting and Mode of Administration Persons requiring a proxy informant, or a language interpreter were not eligible. Participants aged 60 years and older, who spoke English or Spanish, in the NHANES 2019-March 2020 convenience sample were eligible. Analysts may make their own determinations about which variable responses to use when calculating MoCA-SA scores, or may choose to only analyze scores from individual subdomains. Information obtained during test administration that may be related to cognitive performance (e.g., speech, hearing and visual difficulties) or to the testing environment were coded and included in the data set. The data file contains variables that provide scores for each MoCA-SA item. This instrument was selected for NHANES to shorten administration time and respondent burden while preserving the sensitivity of the original MoCA. Scores for the MoCA-SA (ranging from 0 to 20) are highly correlated with full MoCA scores (Kotwal et al., Dale et al.). ![]() The MoCA-SA incorporates items from 8 MoCA cognitive subdomains: (1) orientation (2) naming: (3) executive function (4) visuo-construction (5) memory (6) attention (7) language and (8) abstraction. The MoCA-SA is based on Montreal Cognitive Assessment (MoCA), a multidimensional cognitive screening instrument frequently used by clinical health professionals to detect mild cognitive impairment and Alzheimer's disease (Nasreddine et al.). Please refer to the Analytic Notes section for more details on the use of the data.Ĭognitive functioning (variable name prefix CFQ) testing was performed using the survey-adapted Montreal Cognitive Assessment (MoCA-SA), developed, and administered for the National Social Life, Health and Aging Project (Shega et al.). civilian non-institutionalized population. Any analyses based solely on the 2019-March 2020 data would not be generalizable to the U.S. Data collected in 2019-March 2020 can be accessed as convenience samples through the NCHS Research Data Center (RDC). As a result, data collection for the NHANES 2019-2020 cycle, including the cognitive functioning assessment, was not completed. The NHANES program suspended field operations in March 2020 due to the coronavirus disease 2019 (COVID-19) pandemic.
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