Table 3.
Main analysis, comparison of physical activity by time and group.
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Baseline to 6 weeks, estimate (95% CI) | P value | Baseline to 12 weeks, estimate (95% CI) | P value | Baseline to 24 weeks, estimate (95% CI) | P value | Group×time P value | |||||||||
| Accelerometer-measured moderate to vigorous physical activity per weeka,b | —c | — | — | — | — | — | .05 | |||||||||
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Tailoring+Fitbit (n=78) | — | — | 1.03 (0.76 to 1.40) | .83 | — | — | — | ||||||||
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Tailoring only (n=96) | — | — | 0.96 (0.71 to 1.30) | .79 | — | — | — | ||||||||
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Control (n=69) | — | — | 0.65 (0.48 to 0.89) | .006 | — | — | — | ||||||||
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Tailoring+Fitbit vs control | — | — | 1.59 (1.06 to 2.38) | .02 | — | — | — | ||||||||
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Tailoring only vs control | — | — | 1.48 (0.99 to 2.20) | .06 | — | — | — | ||||||||
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Tailoring+Fitbit vs tailoring only | — | — | 1.08 (0.73 to 1.59) | .71 | — | — | — | ||||||||
| Self-reported total physical activity per weeka | — | — | — | — | — | — | .02 | |||||||||
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Tailoring+Fitbit (n=78) | 2.31 (1.83 to 2.93) | <.001 | 2.24 (1.80 to 2.77) | .001 | 1.83 (1.44 to 2.32) | <.001 | — | ||||||||
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Tailoring only (n=96) | 2.11 (1.64 to 2.72) | <.001 | 2.19 (1.71 to 2.80) | <.001 | 2.28 (1.82 to 2.87) | <.001 | — | ||||||||
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Control (n=69) | 1.44 (1.07 to 1.93) | .01 | 1.99 (1.53 to 2.59) | <.001 | 2.24 (1.61 to 3.12) | <.001 | — | ||||||||
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Tailoring+Fitbit vs control | 1.61 (1.11 to 2.33) | .01 | 1.12 (0.80 to 1.58) | .52 | 0.82 (0.55 to 1.22) | .32 | — | ||||||||
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Tailoring only vs control | 1.47 (1.00 to 2.16) | .05 | 1.10 (0.77 to 1.58) | .61 | 1.02 (0.68 to 1.52) | .92 | — | ||||||||
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Tailoring+Fitbit vs tailoring only | 1.10 (0.78 to 1.55) | .59 | 1.02 (0.74 to 1.41) | .90 | 0.80 (0.58 to 1.11) | .18 | — | ||||||||
| Accelerometer-measured sedentary time per dayb,d | — | — | — | — | — | — | .79 | |||||||||
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Tailoring+Fitbit (n=78) | — | — | 57.50 (9.65 to 105.34) | .02 | — | — | — | ||||||||
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Tailoring only (n=96) | — | — | 38.66 (–6.10 to 83.42) | .09 | — | — | — | ||||||||
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Control (n=69) | — | — | 56.07 (6.09 to 106.04) | .03 | — | — | — | ||||||||
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Tailoring+Fitbit vs control | — | — | 1.43 (–66.67 to 69.54) | .96 | — | — | — | ||||||||
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Tailoring only vs control | — | — | –17.41 (–81.02 to 46.20) | .59 | — | — | — | ||||||||
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Tailoring+Fitbit vs tailoring only | — | — | 18.84 (–42.03 to 79.70) | .55 | — | — | — | ||||||||
| Self-reported sitting time per dayd | — | — | — | — | — | — | — | |||||||||
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Tailoring+Fitbit (n=78) | –67.47 (–129.93 to –5.02) | .03 | –119.36 (–190.19 to –48.53) | .001 | –123.04 (–201.38 to –44.70) | .002 | .13 | ||||||||
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Tailoring only (n=96) | –99.41 (–169.81 to –29.00) | .005 | –68.58 (–144.76 to 7.60) | .08 | –106.13 (–183.01 to –29.24) | .006 | — | ||||||||
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Control (n=69) | –58.29 (–120.50 to 3.93) | .06 | 13.68 (–50.66 to 78.01) | .68 | –37.44 (–105.7 to 30.83) | .29 | — | ||||||||
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Tailoring+Fitbit vs control | –9.19 (–96.16 to 77.79) | .84 | –133.04 (–228.45 to –37.63) | .007 | –85.60 (–187.84 to 16.64) | .10 | — | ||||||||
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Tailoring only vs control | –41.12 (134.26 to 52.02) | .38 | –82.25 (–181.59 to 17.08) | .11 | –68.68 (–171.22 to 33.85) | .19 | — | ||||||||
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Tailoring+Fitbit vs tailoring only | 31.93 (–61.69 to 125.56) | .50 | –50.78 (–153.91 to 52.34) | .33 | –16.91 (–125.93 to 92.10 | .76 | — | ||||||||
aReported as percentage change.
bAnalyses controlled for accelerometer wear time.
cNot available.
dReported as mean difference.