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- W3179357002 abstract "PURPOSE: To determine differences in time spent in posture and activity domains between different direct observation (DO) time sampling approaches and compare the amount of time it took to annotate posture and activity across different sampling approaches. METHODS: Participants (n = 10, mean age 40.7 ± 22.3 yrs, 5F) were video recorded for 2-hrs within a free-living setting. DO videos were annotated with two different schemas: one focused on posture and the other focused on activity behavior types. Under each schema, DO videos were randomly annotated using 3 different time sampling approaches: 1-sec, 5- and 10-sec. For analysis, output from 5- and 10-sec approaches were converted to 1-sec epochs and output from all approaches were simultaneously time-matched. Posture annotations were collapsed into categories and activity types were collapsed into domains. Total time within 1-sec posture categories and activity domains are compared to 5- and 10-sec outputs and percent agreement was calculated. RESULTS: 1183 minutes of DO were recorded. Table 1 shows the total time estimates from the 1-sec approach and 5- and 10-sec total time differences from 1-sec estimates within each posture category and activity domain (1-sec minus 5- and 10-sec totals). On average for posture, the 1-sec approach took 183.9 ± 34.2 min to annotate with the 5-sec approach being 30.9% faster with 86.5% agreement and the 10-sec approach being 42.6% faster with 79.8% agreement. For activity, the 1-sec approach took 118.8 ± 23.6 min to annotate with the 5-sec approach being 16.1% faster with 90% agreement and the 10-sec approach being 25.8% faster with 84% agreement. CONCLUSIONS: Different time sampling approaches utilized with DO provide different total time estimates of posture and activity domains and take different amounts of time to annotate. Future work is warranted in describing context for when differences occur, and exploring ways to decrease DO annotation time. (Supported by NIH Grant 1R01CA215318)" @default.
- W3179357002 created "2021-07-19" @default.
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- W3179357002 date "2021-08-01" @default.
- W3179357002 modified "2023-09-27" @default.
- W3179357002 title "Comparison Of Physical Activity Metrics Obtained From Different Direct Observation Time Analysis Approaches" @default.
- W3179357002 doi "https://doi.org/10.1249/01.mss.0000761528.29278.9f" @default.
- W3179357002 hasPublicationYear "2021" @default.
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