Comparison of accelerometer-derived estimates for the US adult population ≥20 years (NHANES 2003–2004) obtained with different wear-time estimation algorithms
| Algorithm 1* | Algorithm 2† | |
|---|---|---|
| N | ||
| Valid days | 19 927 | 20 508 |
| Participants with 1+ day valid data | 3785 | 3807 |
| Participants with 4+ days valid data | 3078 | 3156 |
| Mean (SD)‡ | ||
| Wear time (min/day) | 839 (103) | 855 (117) |
| Sedentary time (min/day) | 473 (122) | 494 (139) |
| Corrected sedentary time (min/day)§ | 469 (103) | 492 (108) |
| Sedentary time (% worn time) | 56.3 (12.5) | 57.4 (12.8) |
↵* Defines non-wear periods as ≥60 min at zero intensity, including up to two consecutive minutes of maximum intensity 99 cpm.
↵† Defines non-wear periods as ≥60 min at zero intensity, including up to a total of 2 min of maximum intensity 49 cpm.
↵‡ Mean (SD) are weighted (for sampling and non-response) to the US population.
↵§ Corrected for wear time by the residuals method.