Table 1.
SPIRIT Figure: Schedule of enrollment, intervention, and assessments.
| Time point | Study period | ||||||||
| Recruitment | Enrollment and allocation | Postallocation daily food surveys | Close out | ||||||
| −t1 | 0 | t1 | t2 | t3 | t4 | t5 | t6 | ||
| Enrollment | |||||||||
|
|
Eligibility screen | X | —a | — | — | — | — | — | — |
|
|
Informed consent | — | X | — | — | — | — | — | — |
|
|
Allocation | — | X | — | — | — | — | — | — |
| Interventions | |||||||||
|
|
Positive affect and episodic future thinking | — | X | — | — | — | — | — | X |
|
|
Positive affect | — | X | — | — | — | — | — | X |
|
|
Episodic future thinking | — | X | — | — | — | — | — | X |
|
|
Neutral affect and episodic recent thinking | — | X | — | — | — | — | — | X |
| Assessments | |||||||||
|
|
Baseline: TDb | — | X | — | — | — | — | — | — |
|
|
Baseline: Food demand | — | X | — | — | — | — | — | — |
|
|
Outcome: TD | — | X | — | — | — | — | — | X |
|
|
Outcome: Food demand | — | X | — | — | — | — | — | X |
|
|
Outcome: Food choice | — | X | — | — | — | — | — | X |
|
|
Outcome: Daily food surveys | — |
|
X | X | X | X | X | — |
|
|
Assessments before allocationc | — | X | — | — | — | — | — | — |
|
|
Assessments after allocationd | — | X | — | — | — | — | — | — |
|
|
Assessments at close oute | — |
|
— | — | — | — | — | X |
|
|
Repeated assessments (before allocation and at close out)f | — | X | — | — | — | — | — | X |
a—: not applicable.
bTD: temporal discounting.
cAssessments before allocation: food frequency, reward-based eating, health-specific self-efficacy, weight related eating, health locus of control, perceived stress reactivity.
dAssessments after allocation: emotion regulation, trait mindfulness, behavioral motivations, impulsiveness, mental health history, physical health history, demographics.
eAssessments at closeout: global self-reported health, self-reported weight status, social desirability, coping responses, tobacco and alcohol use, sleep quality, loneliness, psychological flexibility.
fRepeated assessments (before allocation and at closeout): stages of change in weight management; Covariate measures included in analyses: perceived stress, positive and negative affect, and depressive symptoms.”