Table 3.
Descriptive data for mean medication adherence and adolescent/young adult survey scores by group allocation and time point.
| Variable | Baseline | Postrandomization | P valuea | Cohen db | |||||||||
|
|
mean (SD) | Range | mean (SD) | Range |
|
|
|||||||
| Overall medication adherence | .97 |
|
|||||||||||
|
|
Active controlc | 80.60 (22.47) | 32.14-100 | 76.76 (27.31) | 21.43-100 |
|
.15 | ||||||
|
|
Interventiond | 79.46 (22.62) | 35.71-100 | 76.00 (27.00) | 7.14-100 |
|
.14 | ||||||
| Medication self-efficacy | .57 |
|
|||||||||||
|
|
Active control | 7.90 (1.74) | 4.08-9.75 | 8.03 (1.88) | 3.83- 9.83 |
|
–.07 | ||||||
|
|
Intervention | 7.95 (1.95) | 3.33- 9.67 | 7.83 (2.36) | 2.92- 10.00 |
|
.06 | ||||||
| Positive outcome expectancies | .42 |
|
|||||||||||
|
|
Active control | 5.81 (0.56) | 5.05- 6.75 | 5.85 (0.40) | 5.30- 6.80 |
|
–.08 | ||||||
|
|
Intervention | 5.70 (1.00) | 4.00-7.00 | 5.94 (0.90) | 3.85-7.00 |
|
–.25 | ||||||
| Negative outcome expectancies | .61 |
|
|||||||||||
|
|
Active control | 2.07 (1.12) | 1.00-4.31 | 2.19 (1.24) | 1.00-5.31 |
|
–.10 | ||||||
|
|
Intervention | 1.72 (0.94) | 1.00-4.62 | 1.91 (1.09) | 1.00-5.46 |
|
–.19 | ||||||
| Barriers to adherence | .79 |
|
|||||||||||
|
|
Active control | 2.23 (0.55) | 1.35-3.41 | 2.25 (0.69) | 1.12-3.65 |
|
–.03 | ||||||
|
|
Intervention | 1.94 (0.56) | 1.18-2.94 | 1.92 (0.66) | 1.00-3.35 |
|
.03 | ||||||
| Motivation for adherence | .46 |
|
|||||||||||
|
|
Active control | 7.88 (2.41) | 2.00-10.00 | 8.44 (2.92) | 1.00-10.00 |
|
–.21 | ||||||
|
|
Intervention | 8.30 (2.44) | 1.00-10.00 | 7.87 (2.71) | 3.33-10.00 |
|
.17 | ||||||
| Importance of adherence | .18 |
|
|||||||||||
|
|
Active control | 9.25 (1.72) | 3.33-10.00 | 8.81 (1.85) | 3.33-10.00 |
|
.25 | ||||||
|
|
Intervention | 9.24 (1.58) | 4.00-10.00 | 9.19 (1.98) | 3.33-10.00 |
|
.03 | ||||||
aP values are for group by time interactions for changes in mean adherence or surveys.
bCohen d reflects the magnitude of change within randomization group from baseline to postrandomization.
cReminder-only Message active control group.
dReminder+COM-B Message intervention group.