Table 3.
Stratum and variable | Sedentary activitya | Light activitya | Moderate to vigorous activitya | |
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 recallb, in min (and in %) | 10 (+1) | −5 (−1) | 0 (+0) | |
P differencec | .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 recallb, in min (and in %) | 10 (+1%) | 0 (+0%) | 0 (+0%) | |
P differencec | .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 recallb, in min (and in %) | 25 (+3%) | −18 (−9%) | 8 (+0%) | |
P differencec | .55 | .24 | .22 | |
Spearman correlation | .76 | .87 | .83 | |
P value for the influence of age on the difference between cpar24 and accelerometer datad | .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 recallb, in min (and in %) | 25 | −5 | 0 | |
P differencec | .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 recallb, in min (and in %) | −10 (−1) | 0 (+0) | 0 (+0) | |
P differencec | .49 | .80 | .37 | |
Spearman correlation | .75 | .66 | .92 | |
P value for the influence of gender on the difference between 1st and 2nd 24-h recalld | .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 recallb, in min (and in percent) | 5 | 0 | 0 | |
P differencec | .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 recallb, in min (and in %) | 15 (+1) | −15 (−7) | 0 (+0) | |
P differencec | .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 recalld | .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.