Table 6.
Self-monitoring engagement by treatment arm.
| Self-monitoring engagement by time period | Median (interquartile range) | ||||
|
|
Simultaneous (n=32) | Sequential (n=34) | App-Only (n=34) | P value | |
| Baseline to 4 weeks (out of 28 days) | |||||
|
|
Number of days per week tracked weight | 6.25 (2.63 to 6.75) | 5.75 (3.50 to 6.50) | 0 (0 to 0.75) | —a |
|
|
Number of days per week tracked diet | 6.50 (3.88 to 7.00) | 0 (0) | 5.38 (2.25 to 7.00) | — |
|
|
Percentage of days tracked weight | 89 (37 to 96) | 82 (50 to 93) | 0 (0 to 11) | .52b; <.001c |
|
|
Percentage of days tracked diet | 93 (55 to 100) | 0 (0) | 77 (32 to 100) | .37d; <.001c |
| 5 to 12 weeks (out of 55 days) | |||||
|
|
Number of days per week tracked weight | 4.50 (0.69 to 6.13) | 4.06 (0.75 to 6.63) | 0 (0 to 0.25) | — |
|
|
Number of days per week tracked diet | 4.88 (0.44 to 6.56) | 1.88 (0.25 to 5.50) | 1.44 (0 to 4.25) | — |
|
|
Percentage of days tracked weight | 65 (10 to 89) | 59 (11 to 95) | 0 (0 to 4) | .95b; <.001c |
|
|
Percentage of days tracked diet | 70 (6 to 95) | 27 (4 to 80) | 21 (0 to 62) | .54c; .17e |
| Entire intervention (out of 83 days) | |||||
|
|
Number of days per week tracked weight | 5.08 (1.75 to 6.25) | 4.83 (1.92 to 6.25) | 0.08 (0 to 0.58) | — |
|
|
Number of days per week tracked diet | 5.33 (1.83 to 6.67) | —f | 2.92 (1.17 to 5.17) | — |
|
|
Percentage of days tracked weight | 73 (25 to 90) | 70 (28 to 90) | 1 (0 to 8) | .92b; <.001c |
|
|
Percentage of days tracked diet | 77 (27 to 96) | —f | 42 (17 to 75) | .10d |
|
|
Percentage of action plans completed | 70 (14 to 91) | 27 (9 to 82) | — | .21b |
| 13 weeks to 6 months (postintervention; out of 99 days)g | |||||
|
|
Number of days per week tracked weight | 0.32 (0 to 0.89) | 0.43 (0 to 1.64) | 0 (0 to 0.14) | — |
|
|
Number of days per week tracked diet | 0.14 (0 to 1.18) | 0 (0 to 0.29) | 0 (0 to 0.43) | — |
|
|
Percentage of days tracked weight | 5 (0 to 14) | 7 (0 to 23) | 0 (0 to 2) | .78b; .004c |
|
|
Percentage of days tracked diet | 3 (0 to 17) | 0 (0 to 5) | 0 (0 to 6) | .96c; .43e |
aNot applicable.
bSimultaneous arm versus Sequential arm.
cSequential arm versus App-Only arm.
dSimultaneous arm versus App-Only arm.
eAll arms.
fAs the Sequential arm did not track diet in the first 4 weeks of the intervention, their results for the “Entire intervention” section would be the same as the results in the “5 to 12 weeks” section above.
gOne additional participant was omitted in analyses (App-Only arm) at 6 months because of becoming ineligible after the intervention period and before 6-months.