Clinical trial NCT02591329: Increasing Household Purchase and Child Consumption of Calcium Products
Official title: Increasing Household Purchase and Child Consumption of Calcium Products: A Randomised Controlled Trial
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Dietary Modification
Lead sponsor: University of British Columbia
Sponsor class: OTHER
First posted: 2015-10-29
Enrollment: 189
Sex: ALL
Standard ages: CHILD
ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: SUPPORTIVE_CARE

Brief summary: The objective of this research is to test the effectiveness of persuasive messages targeted at parents who have children who consume inadequate amounts of calcium. Specifically, the effectiveness of the intervention material on increase a) the purchase of calcium-rich products by parents, and b) the consumption of calcium-rich products in the parent and child will be examined in 400 families across Canada. Families will receive either the targeted intervention materials or standard of care generic nutrition materials retrieved from Health Canada's website. Materials will be delivered to parents during weeks 0, 8, 16, and 22 of the study. Monitoring of parents' calcium product purchases and consumption behaviour in both parents and children will occur at week 0,12, 24 weeks (immediately post-intervention) and at 52 weeks (i.e., 6-month follow-up). Purchases will be verified by grocery receipts made during the aforementioned weeks. Parents will self-report on their dietary consumption as well as their child's using a food frequency questionnaire. The study hypotheses are as follows:

1. Parents in the experimental condition will purchase more calcium-rich products as compared to parents in the control condition.
2. Parents and children in the experimental condition will consume more calcium rich products as compared to parents and children in the control condition.
3. Perceived outcome expectancies of consuming calcium-rich products will increase to a greater extent in parents in the experimental condition as compared to parents in the control condition.
4. Self-regulatory efficacy to consume calcium-rich products will increase to a greater extent in parents in the experimental condition as compared to parents in the control condition.
5. Perceived social support and role modelling behaviour will be highest in parents in the experimental condition as compared to parents in the control condition.
6. Self-regulatory efficacy and outcome expectancies will mediate the changes in calcium-rich product purchases and consumption.


Eligibility criteria: Inclusion Criteria:

* Parent of a child between the ages of 4 and 10
* The child consumes less than the recommended daily intake of calcium (1300mg for youth aged 9-10 and 1000mg for children aged 4-8)
* Parent and child have no dietary restrictions, allergies, or medical reasons for limiting intake of dairy products
* Parent can read and speak English

Exclusion Criteria:

* Dietary restrictions, allergies, or medical reasons for limiting intake of dairy products

Primary outcomes:
measure: Changes in Purchasing Behaviour
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
measure: Changes in Adult Consumption Behaviour
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
measure: Changes in Child Consumption Behaviour
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
Secondary outcomes:
measure: Changes in Outcome Expectations
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
measure: Changes in Self-Regulatory Efficacy Beliefs
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
measure: Changes in Parent Social Support
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
measure: Changes in Perceived Role Modelling
timeFrame: Baseline (before the intervention begins), week-12 (mid point of the intervention), week-24 (immediately after the intervention), week-52 (6-months after the intervention is complete)
Other outcomes:
Locations:
city: Kelowna
country: Canada
facility: Health and Exercise Psychology Laboratory
state: British Columbia
Study officials:
References: