BMC Medical Research Methodology

Table 5 Distribution of the number of non-wear periods according to the algorithm used

From: Comparison and validation of accelerometer wear time and non-wear time algorithms for assessing physical activity levels in children and adolescents

	Frequency (% of days)						Range	Kappa^a
	0	1	2	3	4	≥ 5
Log diary method	50.7	42.5	5.2	1.6	0	0	0–3	–
Troiano et al. (2008)[11]	77.3	17.9	4.5	0.3	0	0	0–3	0.11 [0.02; 0.20]
Choi et al. (2012)[15]	90.1	8.5	1.4	0	0	0	0–2	0.09 [0.02; 0.16]
60 min	70.1	25.0	4.2	0.7	0	0	0–3	0.09 [−0.01; 0.18]
30 min	47.4	32.5	16.9	2.3	0.3	0.6	0–5	0.17 [0.08; 0.25]
20 min	26.6	29.6	20.1	10.7	4.9	8.1	0–11	0.07 [0.03; 0.12]
15 min	2.3	4.2	9.1	12.4	9.7	62.3	0–25	0.01 [0.00; 0.02]
10 min	1.9	3.3	9.7	10.1	11.4	63.6	0–25	0.01 [0.00; 0.01]

^aWeighted Cohen’s Kappa coefficients and theirs 95% confidence intervals for the agreement assessment between methods with the gold standard method (log diary method)

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