Method of assessing parent-child grocery store purchasing interactions using a micro-camcorder

Area of Science:

• Behavioral Science
• Nutritional Science
• Human-Computer Interaction

Background:

• Understanding parent-child interactions in food purchasing is crucial for public health.
• Traditional observational methods may miss key details of in-store behaviors.
• Participant-worn technology offers a novel approach to ecological data collection.

Purpose of the Study:

• To validate the use of participant worn micro-camcorders (PWMC) for collecting data on parent-child food and beverage purchasing interactions.
• To compare the sensitivity and validity of PWMC data against in-person observations and purchase receipts.

Main Methods:

• 32 parent-child dyads participated, with children aged 2-6 years wearing a micro-camcorder.
• Data collected via PWMC and in-person observation were coded for behavioral and environmental variables.
• PWMC data validity was assessed against in-person observation and receipt data.

Main Results:

• PWMC revealed significantly more parent-child food purchasing interactions (1.4 more per trip) compared to in-person observation.
• Inter-rater reliability for PWMC data coding ranged from moderate to almost perfect (Cohen's kappa = 0.461-0.937).
• PWMC showed strong correlations with in-person observations (rho = 0.911) and substantial agreement with receipt data (Cohen's kappa = 0.787).

Conclusions:

• Participant worn micro-camcorders are a valid and sensitive tool for studying parent-child food purchasing behaviors in grocery settings.
• PWMC offers a reliable method for capturing detailed interactions and purchasing decisions.
• This technology enhances the accuracy of data collection in real-world environments.