Trial Outcomes & Findings for Delays to Influence Snack Choice (NCT NCT02359916)

Results Overview

For each experimental condition, we will calculate the proportion of healthy vs unhealthy snacks sold over 4 weeks.

Recruitment status

COMPLETED

Target enrollment

32662 participants

Primary outcome timeframe

28 weeks per vending location

Results posted on

2018-02-23

Participant Flow

Unit of analysis: Vends

Participant milestones

Participant milestones
Measure	Baseline 1 Snacks sold under equal pricing, no delays. Baseline 1 was always the first condition at all vending sites.	Discount Only Healthier snacks sold at 25% or $0.25 discount, no delays 25%/$0.25 discount on healthy snacks	Delay Only Less healthy snacks sold at equal pricing with delays 25-second time delays on delivery of less healthy snacks	Delay + Discount Healthy snacks sold at 25% or $0.25 discount, plus delays on less healthy snacks 25-second time delays on delivery of less healthy snacks 25%/$0.25 discount on healthy snacks	Tax Only Less healthy snacks sold at 25% or $0.25 higher price, no delays 25%/$0.25 tax on less healthy snacks	Delay + Tax Less healthy snacks sold at 25% or $0.25 higher price, plus delays Time delays on delivery of less healthy snacks 25%/$0.25 tax on less healthy snacks	Baseline 2 Snacks sold under equal pricing, no delays. Baseline 2 was always the last condition at all vending sites.
Overall Study STARTED	0 5481	0 5784	0 7473	0 1996	0 2846	0 3438	0 5644
Overall Study COMPLETED	0 5481	0 5784	0 7473	0 1996	0 2846	0 3438	0 5644
Overall Study NOT COMPLETED	0 0	0 0	0 0	0 0	0 0	0 0	0 0

Reasons for withdrawal

Withdrawal data not reported

Baseline Characteristics

Delays to Influence Snack Choice

Baseline characteristics by cohort

Baseline data not reported

PRIMARY outcome

Timeframe: 28 weeks per vending location

Population: In this table, each vend is treated as an analyzed participant. No data were collected from individual human subjects. Analyses included all available data on healthy and regular snack vends. Data from Baseline 1 and Baseline 2 were combined into a single arm/group ("Baseline") in statistical analyses.

For each experimental condition, we will calculate the proportion of healthy vs unhealthy snacks sold over 4 weeks.

Outcome measures

Outcome measures
Measure	Baseline n=11125 Vends Snacks sold under equal pricing, no delays. Data from Baseline 1 and 2 were combined in this analysis.	Discount Only n=5784 Vends Healthier snacks sold at 25% or $0.25 discount, no delays 25%/$0.25 discount on healthy snacks	Delay Only n=7473 Vends Less healthy snacks sold at equal pricing with delays 25-second time delays on delivery of less healthy snacks	Delay + Discount n=1996 Vends Healthy snacks sold at 25% or $0.25 discount, plus delays on less healthy snacks 25-second time delays on delivery of less healthy snacks 25%/$0.25 discount on healthy snacks	Tax Only n=2846 Vends Less healthy snacks sold at 25% or $0.25 higher price, no delays 25%/$0.25 tax on less healthy snacks	Delay + Tax n=3438 Vends Less healthy snacks sold at 25% or $0.25 higher price, plus delays Time delays on delivery of less healthy snacks 25%/$0.25 tax on less healthy snacks
Proportion of Healthy Snacks Purchased	.403 proportion of vends from healthy snacks	.431 proportion of vends from healthy snacks	.429 proportion of vends from healthy snacks	.465 proportion of vends from healthy snacks	.542 proportion of vends from healthy snacks	.501 proportion of vends from healthy snacks

SECONDARY outcome

Timeframe: Number of days per condition were as follows - Baseline: 119 days, Discount only: 59 days, Delay only: 68 days, Delay + Discount: 49 days, Tax only: 73 days, Delay + Tax: 60 days

Population: The unit of analysis is vending revenue per day ($/day). Data from Baseline 1 and Baseline 2 were combined into a single arm/group ("Baseline") in this analysis.

Total vending machine revenue under each condition