Table 3.
The correlation between self-reported time (IPAQ-SF) spent on three different physical activity intensities with measures from SWA, for total-, inactive- and active group, using Spearman correlation coefficient (SCC) (n = 64)
| Intensity | IPAQ-SF | SWA | |
|---|---|---|---|
| Total group | Median (Q1,Q3)/ ln mean (SD) min/week |
Median (Q1,Q3)/ ln mean (SD) min/week |
τ (p) |
| MPA | 40 (0,120)/2.8 (2.3) | 139 (47,223)/4.5 (1.5) | 0.08 (p = 0.536) |
| VPA | 28 (42) ¶/1.5 (2.1) | 2 (9) ¶/0.2 (0.9) | 0.39 ( p = 0.002) |
| MVPA | 80 (0,148)/3.2 (2.4) | 168 (51,293)/4.7 (1.5) | 0.14 (p = 0.280) |
| Inactive group (MVPA measured with SWA < 150 min/week) n = 30 | |||
| MPA | 50 (0,125)/2.8 (2.4) | 44 (14,96)/3.4 (1.5) | 0.38 (p = 0.037) |
| VPA | 16 (33) ¶/1.0 (1.8) | 0/0.0 | - |
| MVPA | 70 (0,125)/3.0 (2.5) | 47 (14,120)/3.6 (1.5) | 0.25 (p = 0.186) |
| Active group (MVPA measured with SWA ≥150 min/week) n = 34 | |||
| MPA | 40 (0,120)/2.9 (2.2) | 210(175,319)/5.5 (0.4) | −0.02 (p = 0.905) |
| VPA | 39 (47) ¶/2.1 (2.2) | 4 (12) ¶/0.4 (1.1) | 0.42 (p = 0.013) a |
| MVPA | 115 (0,180)/3.4 (2.3) | 290(193,362)/5.7 (1.1) | −0.06 (p = 0.726) |
¶ Presented as mean min/week (SD) and not as median, due to median and IQR value zero for the skewed data
IPAQ-SF: International Physical Activity Questionnaire short form
SWA: SenseWear Armband
Q1: First quartile, 25% of scores has value lower than Q1
Q3: Third quartile, 75% of scores has value lower than Q3
ln: natural logarithm
SD: standard deviation
τ = Spearman correlation coefficient, SCC
p = level of significance
MPA: moderate physical activity
VPA: vigorous physical activity
MVPA: moderate to vigorous physical activity