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. Author manuscript; available in PMC: 2017 Sep 1.
Published in final edited form as: Prev Med. 2016 Jul 7;90:207–215. doi: 10.1016/j.ypmed.2016.07.002

Table 2.

Model Estimated Changes in Moderate-to-Vigorous Physical Activity (MVPA) and Time Spent Sedentary from spring 2013, 2014, and 2015

Moderate-to-Vigorous Physical Activity (minutes/day) Time Spent Sedentary (minutes/day)
Immediate Delayed Within-Between
Group
P-values		 Within
Group
P-values		 Immediate Delayed Within-Between
Group P-values		 Within
Group
P-values
Quantile Year Est. (SE) Est. (SE) Differencea Treatment Time Time-
×-
Treatment		 Immediatec Delayedb Est. (SE) Est. (SE) Difference Treatment Time Time-
×-
Treatment		 Immediatec Delayedb
Boys
25 th Spring 13 15.8 (0.6) 14.6 (0.7) 1.2 0.173 0.001 0.175 50.2 (0.9) 52.6 (1.4) −2.4 0.0370 0.0020 0.0130
Spring 14 18.6 (0.7) 16.2 (0.7) 2.4 45.4 (1.1) 49.1 (1.1) −3.7
Spring 15 19.3 (0.7) 17.1 (0.9) 2.2 42.9 (1.3) 49.9 (1.3) −7.0
Baseline vs. Final Intervention Time Pointb 3.5 (0.7) 0.9 (0.8) 2.6 0.093 −7.3 (1.1) 0.8 (1.3) −8.1 0.970
Intervention Y01 vs. Y02c 0.7 (0.7) — 0.445 −2.5 (1.2) — 0.062
50 th Spring 13 23.0 (0.7) 21.6 (0.9) 1.4 0.131 0.010 0.011 60.7 (1.0) 63.1 (1.3) −2.4 0.015 0.001 0.047
Spring 14 26.6 (0.7) 22.6 (0.9) 4.0 55.4 (0.9) 60.8 (1.1) −5.4
Spring 15 27.0 (0.9) 23.9 (0.9) 3.1 53.5 (1.1) 59.2 (1.2) −5.7
Baseline vs. Final Intervention 4.0 (1.0) 1.3 (0.9) 2.7 0.056 −7.2 (1.2) −1.6 (1.1) −5.6 0.036
Time Pointb
Intervention Y01 vs. Y02c 0.4 (0.8) — 0.494 −1.9 (0.9) — 0.007
75 th Spring 13 31.3 (0.7) 30.0 (0.8) 1.3 0.255 0.444 0.006 73.6 (1.1) 74.7 (1.4) −1.1 0.031 0.001 0.005
Spring 14 34.5 (0.8) 30.6 (0.8) 3.9 65.9 (1.2) 71.9 (1.4) −6.0
Spring 15 35.6 (0.8) 30.7 (0.7) 4.9 65.0 (1.5) 69.6 (1.6) −4.6
Baseline vs. Final Intervention Time Pointb 4.3 (0.9) 0.1 (0.9) 4.2 0.204 −8.6 (1.5) −2.3 (1.2) −6.3 0.078
Intervention Y01 vs. Y02c 1.1 (0.9) — 0.130 −0.9 (1.1) — 0.104
Girls
25 th Spring 13 12.1 (0.5) 10.7 (0.6) 1.4 0.017 0.005 0.001 56.8 (0.8) 58.1 (1.4) −1.3 0.281 0.230 0.765
Spring 14 14.0 (0.6) 12.0 (0.5) 2.0 54.9 (1.1) 56.9 (1.3) −2.0
Spring 15 12.6 (0.7) 14.5 (0.6) −1.9 54.3 (1.2) 56.2 (1.5) −1.9
Baseline vs. Final Intervention Time Pointb 0.5 (0.7) 2.5 (0.5) −2.0 0.001 −2.5 (1.3) −0.7 (1.1) −1.8 0.448
Intervention Y01 vs. Y02c −1.4 (0.7) — 0.059 −0.6 (1.1) — 0.625
50 th Spring 13 17.6 (0.6) 16.1 (0.5) 1.5 0.023 0.001 0.147 66.4 (0.8) 69.2 (1.2) −2.8 0.007 0.001 0.436
Spring 14 20.0 (0.7) 16.9 (0.5) 3.1 64.3 (1.2) 67.5 (1.2) −3.2
Spring 15 18.6 (0.8) 19 (0.6) −0.4 63.9 (1.3) 65.5 (1.3) −1.6
Baseline vs. Final Intervention Time Pointb 1.0 (0.9) 2.1 (0.7) −1.1 0.008 −2.5 (1.2) −2.0 (1.1) −0.5 0.021
Intervention Y01 vs. Y02c −1.4 (0.7) — 0.057 −0.4 (1.2) — 0.800
75 th Spring 13 24.2 (0.8) 22.7 (0.9) 1.5 0.120 0.046 0.603 78.2 (0.9) 79.3 (1.2) −1.1 0.112 0.001 0.047
Spring 14 25.3 (0.9) 22.7 (0.8) 2.6 75.6 (1.2) 77.6 (1.4) −2.0
Spring 15 25.6 (0.9) 24.6 (1.0) 1.0 76.9 (1.5) 73.6 (1.5) 3.3
Baseline vs. Final Intervention Time Pointb 1.4 (0.8) 1.9 (0.8) −0.5 0.012 −1.3 (1.5) −4.0 (1.2) 2.7 0.013
Intervention Y01 vs. Y02c 0.3 (1.0) — 0.680 1.3 (1.2) — 0.278

Note: Immediate treatment group received the intervention spring 2014 and 2015. The delayed treatment group received the intervention spring 2015;

a

Between group difference for each measurement year;

b

Within group overall change: Immediate Spring 2015 (last year of intervention) vs. Spring 2013 (baseline), Delayed Spring 2015 (first year of intervention) vs. Spring 2014 (last year of baseline);

c

Difference between intervention Spring 2014 (intervention year 01) and Spring 2015 (intervention year 02) for the immediate group only

Sample size: Boys Immediate, n = 677; Boys Delayed, n = 687; Girls Immediate, n = 613; Girls Delayed, n = 658