Algorithm 1 | Algorithm 2 | Algorithm 3 | |
---|---|---|---|
Sensitivity (%) | |||
Overall (95% CI) | 95.61 (95.16 to 96.05) | 95.43 (94.96 to 95.89) | 95.10 (94.64 to 95.56) |
Worst day | 43.16 | 0 | 0 |
Best day | 100 | 100 | 100 |
Specificity (%) | |||
Overall (95% CI) | 95.61 (95.14 to 96.09) | 97.40 (96.99 to 97.81) | 97.67 (97.32 to 98.03) |
Worst day | 19.93 | 20.11 | 19.93 |
Best day | 100 | 100 | 100 |
Sedentary time classed as non-wear | |||
Days with misclassification (%) | 31.9 | 19.4 | 18 |
Minutes, median (min, max)† | 78 (6, 620) | 75 (26, 600) | 72 (1, 600) |
Non-wear time classed as sedentary | |||
Days with misclassification (%) | 42.8 | 43.7 | 51.3 |
Minutes, median (min, max)† | 49 (1, 329) | 50 (1, 338) | 44 (1, 329) |
Mean difference (95% limits of agreement) estimated – criterion wear time | −11 (−172, 149) | 5 (−134, 143) | 9 (−124, 142) |
↵* The algorithms define non-wear periods as non-movement (ie, 0 cpm and any allowed interruptions) of 60-min duration: Algorithm 1 permits ≤2 consecutive active counts of maximum intensity 99 cpm; Algorithm 2 permits ≤2 active counts of maximum intensity 49 cpm and Algorithm 3 allows no interruptions (requires all counts to be 0 cpm).
↵† Median (minimum, maximum) minutes misclassified (against criterion) on days where misclassification occurred.