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. Author manuscript; available in PMC: 2015 Sep 15.
Published in final edited form as: J Phys Act Health. 2013 Jan 30;11(2):348–358. doi: 10.1123/jpah.2012-0043

Table 6.

Mixed Model Estimatesa (95% CI) of MVPA (Minutes/Day), Measured by Actical Physical Activity Monitors, by Baseline Overweight

Overweight BMI > 85th percentile (n = 22) Normal weight BMI ≤ 85th percentile (n = 109) Difference P-value
Weekly average
 Baseline 54.01 (43.80, 64.21) 77.47 (71.94, 83.01) 23.47 (12.60, 34.33) <0.001
 Week 6 46.55 (36.05, 57.06) 71.18 (65.76, 76.59) 24.62 (13.52, 35.73) <0.001
 Week 12 41.75 (31.71, 51.80) 74.50 (68.79, 80.21) 32.75 (21.92, 43.58) <0.001
Change from baseline
 Week 6 −7.45 (−17.69, 2.78)
P = .147
−6.30 (−11.19, −1.40)
P = .012
1.16 (−10.09, 12.40) 0.837
 Week 12 −12.25 (−21.27, −3.24)
P = .010
−2.97 (−7.79, 1.85)
P = .225
9.28 (−0.83, 19.40) 0.071
Adjustedb change from baseline
 Week 6 −2.45 (−12.43, 7.53)
P = .629
−2.16 (−7.59, 3.28)
P = .436
0.29 (−10.13, 10.71) 0.956
 Week 12 −4.00 (−15.51, 7.51)
P = .495
3.68 (−4.15, 11.51)
P = .356
7.67 (−2.56, 17.91) 0.141
a

Random family effect included to account for multiple children per family. Kronecker (UN@CS) covariance structure used for repeated measures within an individual (3 time points × up to 6 daily measurements per time point). Satterthwaite correction for denominator degrees of freedom.

b

Adjusted for calendar month, age, and sex.