Skip to main content
. Author manuscript; available in PMC: 2013 Nov 4.
Published in final edited form as: Obesity (Silver Spring). 2013 Jan;21(1):32–44. doi: 10.1038/oby.2012.118

Table 2.

Methods comparison of registered time as an indicator of wear period.

Numbers in each cell:
Mean ± S.D. (Sample Size)
Median (Interquartile Range)
8 Hour, 20 Min. without Activity 8 Hour, 30 Min. without Activity 8 Hour, 60 Min. without Activity 10 Hour, 20 Min. without Activity 10 Hour, 30 Min. without Activity 10 Hour, 60 Min. without Activity 12 Hour, 20 Min. without Activity 12 Hour, 30 Min. without Activity 12 Hour, 60 Min. without Activity P-value
≥3 METS for ≥1 minute
 Number of Bouts per Day 27.0 ± 13.8 (N=2148)
24.8 (17.2 – 34.8)
26.8 ± 13.8 (N=2149)
24.6 (17.0 – 34.5)
26.5 ± 13.6 (N=2150)
24.2 (16.6 – 34.0)
27.4 ± 14.2 (N=2145)
25.1 (17.4 – 35.2)
27.2 ± 14.0 (N=2145)
25.0 (17.3 – 35.0)
26.8 ± 13.9 (N=2149)
24.5 (17.0 – 34.5)
28.1 ± 14.7 (N=2119)
25.8 (17.7 – 35.8)
27.9 ± 14.6 (N=2130)
25.5 (17.5 – 35.6)
27.4 ± 14.3 (N=2140)
25.0 (17.3 – 35.2)
0.0010
 Bout Duration (minutes) 2.0 ± 0.8 (N=2146)
1.8 (1.6 – 2.2)
2.0 ± 0.8 (N=2147)
1.8 (1.6 – 2.2)
2.0 ± 0.8 (N=2148)
1.8 (1.6 – 2.2)
2.0 ± 0.8 (N=2143)
1.8 (1.5 – 2.2)
2.0 ± 0.8 (N=2143)
1.8 (1.5 – 2.2)
2.0 ± 0.8 (N=2147)
1.8 (1.5 – 2.2)
2.0 ± 0.8 (N=2116)
1.8 (1.5 – 2.2)
2.0 ± 0.9 (N=2126)
1.8 (1.5 – 2.2)
2.0 ± 0.9 (N=2137)
1.8 (1.5 – 2.2)
0.9994
 Bout Intensity (METS) 3.9 ± 0.3 (N=2146)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2147)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2148)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2143)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2143)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2147)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2116)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2126)
3.8 (3.7 – 4.0)
3.9 ± 0.3 (N=2137)
3.8 (3.7 – 4.0)
1.0000
≥3 METS for ≥ 10 minutes
 Number of Bouts per Day 0.5 ± 0.8 (N=2148)
0.3 (0.0 – 0.7)
0.5 ± 0.8 (N=2149)
0.3 (0.0 – 0.7)
0.5 ± 0.8 (N=2150)
0.3 (0.0 – 0.7)
0.5 ± 0.8 (N=2145)
0.3 (0.0 – 0.7)
0.5 ± 0.8 (N=2145)
0.3 (0.0 – 0.7)
0.5 ± 0.8 (N=2149)
0.3 (0.0 – 0.7)
0.5 ± 0.8 (N=2119)
0.3 (0.0 – 0.8)
0.5 ± 0.8 (N=2130)
0.3 (0.0 – 0.8)
0.5 ± 0.8 (N=2140)
0.3 (0.0 – 0.8)
0.9990
 Bout Duration (minutes) 19.7 ± 9.6 (N=1418)
16.6 (13.0 – 23.4)
19.6 ± 9.6 (N=1425)
16.6 (13.0 – 23.3)
19.6 ± 9.6 (N=1433)
16.6 (13.0 – 23.2)
19.7 ± 9.6 (N=1394)
16.6 (13.0 – 23.4)
19.7 ± 9.6 (N=1402)
16.7 (13.0 – 23.4)
19.7 ± 9.6 (N=1417)
16.6 (13.0 – 23.3)
19.8 ± 9.9 (N=1325)
16.5 (13.0 – 23.6)
19.8 ± 9.9 (N=1348)
16.5 (13.0 – 23.7)
19.8 ± 9.8 (N=1381)
16.5 (13.0 – 23.4)
0.9999
 Bout Intensity (METS) 5.2 ± 0.9 (N=1418)
5.1 (4.5 – 5.7)
5.2 ± 0.9 (N=1425)
5.1 (4.5 – 5.7)
5.2 ± 0.9 (N=1433)
5.1 (4.5 – 5.7)
5.2 ± 0.9 (N=1394)
5.1 (4.5 – 5.7)
5.2 ± 0.9 (N=1402)
5.1 (4.5 – 5.7)
5.2 ± 0.9
(N=1417) 5.1 (4.5 – 5.7)
5.2 ± 1.0 (N=1325)
5.1 (4.5 – 5.7)
5.2 ± 0.9 (N=1348)
5.1 (4.5 – 5.7)
5.2 ± 0.9 (N=1381)
5.1 (4.5 – 5.7)
1.0000
≥6 METS for ≥10 minutes
 Number of Bouts per Day 0.1 ± 0.3 (N=2148)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2149)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2150)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2145)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2145)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2149)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2119)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2130)
0.0 (0.0 – 0.0)
0.1 ± 0.3 (N=2140)
0.0 (0.0 – 0.0)
1.0000
 Bout Duration (minutes) 18.6 ± 8.7 (N=444)
16.0 (12.6 – 21.7)
18.6 ± 8.7 (N=445)
16.0 (12.7 – 21.7)
18.6 ± 8.6 (N=449)
16.0 (12.5 – 21.5)
18.5 ± 8.6 (N=437)
16.0 (12.7 – 21.3)
18.5 ± 8.6 (N=441)
16.0 (12.5 – 21.2)
18.5 ± 8.6 (N=445)
16.0 (12.5 – 21.3)
18.8 ± 8.8 (N=398)
16.0 (12.7 – 21.7)
18.7 ± 9.0 (N=413)
16.0 (12.5 – 21.3)
18.6 ± 9.0 (N=428)
16.0 (12.3 – 21.6)
1.0000
 Bout Intensity (METS) 7.5 ± 1.0 (N=444)
7.2 (6.7 – 8.1)
7.5 ± 1.0 (N=445)
7.2 (6.7 – 8.1)
7.5 ± 1.0 (N=449)
7.2 (6.7 – 8.0)
7.5 ± 1.0 (N=437)
7.2 (6.7 – 8.0)
7.5 ± 1.0 (N=441)
7.2 (6.7 – 8.0)
7.5 ± 1.0 (N=445)
7.2 (6.7 – 8.0)
7.5 ± 1.0 (N=398)
7.2 (6.7 – 8.0)
7.4 ± 1.0 (N=413)
7.2 (6.7 – 8.0)
7.4 ± 1.0 (N=428)
7.2 (6.7 – 8.0)
0.9999
*

The P-values were obtained from the type III test for the fixed effect of criteria being used.

Use of “Wear Time” in column headings is used for brevity to indicate “registered time as an indicator of wear period”.

Sample size changes for bout duration and intensity for the 2 categories as compared to number of bouts since all participants’ data are included in the number of bouts, but only those that met the specific criteria (ex. ≥6 METS for ≥ 10 minutes) are included in the bout duration and intensity. For each specific bout definition, sample size is the same for bout duration and intensity, which signifies the number of participants that met that criterion.