. 2017 May 30;19(5):e186. doi: 10.2196/jmir.7620

Table 3.

Comparison of total time spent in sedentary, light, and moderate to vigorous activity during the 24-hour period across the two 24-hour physical activity recalls (cpar24).

Stratum and variable		Sedentary activity^a	Light activity^a	Moderate to vigorous activity^a
Total time during 24-h period
All participants
	Median total time based on 1st 24-h recall, in min	1010	265	120
	Median total time based on 2nd 24-h recall, in min	990	300	115
	Median difference between 1st and 2nd 24-h recall^b, in min (and in %)	10 (+1)	−5 (−1)	0 (+0)
P difference^c		.60	.89	.68
Spearman correlation		.75	.65	.92
Participants aged < 60 years
	Median total time based on 1st 24-h recall, in min	1035	250	105
	Median total time based on 2nd 24-h recall, in min	1025	295	100
	Median difference between 1st and 2nd 24-h recall^b, in min (and in %)	10 (+1%)	0 (+0%)	0 (+0%)
P difference^c		.88	.55	.10
Spearman correlation		.75	.58	.93
Participants aged ≥60 years
	Median total time based on 1st 24-h recall, in min	1002	288	120
	Median total time based on 2nd 24-h recall, in min	990	305	130
	Median difference between 1st and 2nd 24-h recall^b, in min (and in %)	25 (+3%)	−18 (−9%)	8 (+0%)
P difference^c		.55	.24	.22
Spearman correlation		.76	.87	.83
P value for the influence of age on the difference between cpar24 and accelerometer data^d		.45	.21	.04
Men
	Median total time based on 1st 24-h recall, in min	1010	240	160
	Median total time based on 2nd 24-h recall, in min	1025	255	120
	Median difference between 1st and 2nd 24-h recall^b, in min (and in %)	25	−5	0
P difference^c		.15	.61	.23
Spearman correlation		.75	.64	.94
Women
	Median total time based on 1st 24-h recall, in min	1012	282	85
	Median total time based on 2nd 24-h recall, in min	970	320	82
	Median difference between 1st and 2nd 24-h recall^b, in min (and in %)	−10 (−1)	0 (+0)	0 (+0)
P difference^c		.49	.80	.37
Spearman correlation		.75	.66	.92
P value for the influence of gender on the difference between 1st and 2nd 24-h recall^d		.17	.57	.09
Participants with a BMI<25.0 kg/m²
	Median total time based on 1st 24-h recall, in min	1035	232	128
	Median total time based on 2nd 24-h recall, in min	990	298	128
	Median difference between 1st and 2nd 24-h recall^b, in min (and in percent)	5	0	0
P difference^c		.73	.32	.20
Spearman correlation		.82	.65	.96
Participants with a BMI≥25.0 kg/m²
	Median total time based on 1st 24-h recall, in min	1000	290	105
	Median total time based on 2nd 24-h recall, in min	990	300	70
	Median difference between 1st and 2nd 24-h recall^b, in min (and in %)	15 (+1)	−15 (−7)	0 (+0)
P difference^c		.29	.25	.73
Spearman correlation		.69	.71	.89
P value for the influence of the BMI on the difference between 1st and 2nd 24-h recall^d		.18	.10	.21

^aFor self-reported physical activity (cpar24), we classified the physical activity intensity according to the corresponding metabolic equivalent of the MET value from the Ainsworth compendium: sedentary activity (MET≤1.5), light physical activity (1.5<MET<3.0), moderate to vigorous physical activity (3.0≤MET).

^bPlease note that the median of the difference between 2 variables does not necessarily correspond to the difference between the medians of the 2 variables.

^cWe tested if the median total time spent in sedentary, light or moderate to vigorous activities varied between the 1st and 2nd 24-h recall using the Wilcoxon signed rank test.

^dWe computed the difference in the total time spent in a specific physical activity intensity level between the 1st and 2nd 24-h recall for each participant, and we tested if that difference varied across the two strata of participants using the Wilcoxon rank sum test.

^ecpar24: computer-based 24-h physical activity recall.