Table 1.
Intake | Week 1 | Week 2 | Week 3 | Week 4 | Total | |
Baseline visit | $10 |
|
|
|
|
|
ACASI | $20 | $20 |
|
|
$20 |
|
EMAa |
|
$25/$50 | $25/$50 | $25/$50 | $25/$50 |
|
Close out |
|
|
|
|
$10 |
|
Smartphone returnb |
|
|
|
|
$50/$100 |
|
Total | $30 | $45-$70 | $25-$50 | $25-$50 | $105-$180 | $230-$380 |
aParticipants were paid US $50 every week for answering 80% of their alarms or US $25 every week for answering 60% of their alarms. They received no bonus for answering less than 60% of their alarms or if their phone was uncharged.
bParticipants received US $100 at close out for returning their original phone or US $50 for returning their replacement. They would be excused from the proposed study if they lost their replacement phone.