Validation of the National Aeronautics and Space Administration Task Load Index (NASA-TLX) adapted for the whole day repeated measures context.

Publisher: Informa Healthcare Country of Publication: England NLM ID: 0373220 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1366-5847 (Electronic) Linking ISSN: 00140139 NLM ISO Abbreviation: Ergonomics Subsets: MEDLINE

Publication: London : Informa Healthcare
Original Publication: London, Taylor & Francis.

Task Performance and Analysis* ; United States National Aeronautics and Space Administration*; Adult ; Bayes Theorem ; Diabetes Mellitus, Type 1 ; Humans ; Quality of Life ; United States ; Workload

Our objective was to investigate the validity of four-item and six-item versions of the National Aeronautics and Space Administration Task Load Index (NASA-TLX, or TLX for short) for measuring workload over a whole day in the repeated measures context. We analysed data on 51 people with type 1 diabetes from whom we collected ecological momentary assessment and daily diary data over 14 days. The TLX was administered at the last survey of every day. Confirmatory factor analysis fit statistics indicated that neither the TLX-6 nor TLX-4 were a unidimensional representation of whole day workload. In exploratory analyses, another set of TLX items we refer to as TLX-4v2 was sufficiently unidimensional. Raw sum scores from the TLX-6 and TLX-4v2 had plausible relationships with other measures, as evidenced by intra-person correlations and mixed-effects models. TLX-6 appears to capture multiple factors contributing to workload, while TLX-4v2 assesses the single factor of 'mental strain'. Practitioner Summary: Using within-person longitudinal data, we found evidence supporting the validity of a measure evaluating whole-day workload (i.e. workload derived from all sources, not only paid employment) derived from the NASA-TLX. This measure may be useful to assess how day-to-day variations in workload impact quality of life among adults. Abbreviations: NASA-TLX or TLX: National Aeronautics and Space Administration Task Load Index; TLX-6: six item version of the NASA-TLX; TLX-4: four item version of the NASA-TLX, TLX-4v2: four item NASA-TLX version two; NIOSH: National Institute for Occupational Safety and Health; CFA: confirmatory factor analysis; T1D: type 1 diabetes; EMA: ecological momentary assessment; BG: blood glucose; SD: standard deviation; CV: coefficient of variation; RMSEA: root mean square error of approximation; CFI: comparative fit index; TLI: Tucker-Lewis Index; SRMR: standardized root mean square residual; AIC: Akaike information criterion; BIC: Bayesian information criterion; χ2: Chi-square statistic.

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R01 DK121298 United States DK NIDDK NIH HHS; T42 OH008412 United States OH NIOSH CDC HHS; UL1 TR001855 United States TR NCATS NIH HHS

Keywords: Task load; mental strain; patient ergonomics; type 1 diabetes; workload

Date Created: 20211112 Date Completed: 20220630 Latest Revision: 20230703

20240104

PMC9124236

10.1080/00140139.2021.2006317

34766872