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. 2016 Aug 31;4(3):e104. doi: 10.2196/mhealth.5855

Table 3.

Fixed effects for mixed models associated with moderate-to-vigorous physical activity.

Fixed effects Unconditional means model Model 1 Model 2

β (SE) t (df) P β (SE) t (df) P β (SE) t (df) P
Within-person

Intercept 4.72
(0.25)
19.09
(32.85)
<.001 5.95
(0.51)
11.74
(51.95)
<.001 5.62
(0.53)
10.68
(58.07)
<.001

Linear time


–0.18
(0.05)
–3.90
(15.18)
.001 –0.17
(0.05)
–3.59
(27.96)
.001

Quadratic time


–0.04
(0.01)
–3.97
(1836.18)
<.001 –0.04
(0.01)
–4.08
(1805.99)
<.001

Day of the week


0.17
(0.07)
2.58 (1830.15) .01 0.17
(0.07)
2.42 (1803.66) .02

Hourly mind wandering


0.36
(0.17)
2.15
(1831.54)
.03 0.10
(0.22)
0.44
(1798.93)
.66

Hourly feelings


0.19
(0.08)
2.26
(1823.58)
.02 0.21
(0.09)
2.45
(1802.09)
.02

Feeling*mind wandering


0.21
(0.10)
2.07
(1842.83)
.04 0.23
(0.10)
2.19
(1815.89)
.03

Oversleep





0.51
(0.19)
2.72
(1412.30)
.007

Mind wandering*oversleep





0.41
(0.22)
1.82
(1797.80)
.07