Usability evaluation of food portion measurement using a mobile device

User interface design and usability study of mobile food portion measurement on mobile device using a randomised trial

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

ISRCTN

Registry ID

ISRCTN36710750

Enrollment

120

Registered

2018-03-23

Start date

2017-04-01

Completion date

Unknown

Last updated

2020-05-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Use of mobile device to measure food portions Nutritional, Metabolic, Endocrine

Interventions

This intervention involved three types of user interfaces to record food portion size. Each subject was randomized into three groups to evaluate and compare the effectiveness, efficiency and satisfact

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: 1. Student of Chang Gung University or Chang Gung University of Science and Technology, Taoyuan, Taiwan 2. Aged between 19 and 24 years 3. Capable of reading and operating smartphone apps

Exclusion criteria

Exclusion criteria: 1. Visual impairment 2. Diabetes, high cholesterol, or high blood pressure 3. Pregnant 4. Vegetarian 5. Participating in a weight-loss program 6. Taking medication

Design outcomes

Primary

Measure	Time frame
1. Accuracy of weight/portion size estimation assessed by the absolute weight difference in grams compared with the real food and the number of participants that had within 10% of absolute weight difference or the number of correct counts. 2. Time required to complete the task of weight/portion size estimation for each food using the time from the user entering the food attribute to clicking the 'finished' button measured in milliseconds. Three consecutive meals (i.e., breakfast, lunch, dinner) were measured in a day with 13 food items in total chosen from 25 food items.	—

Measure

Time frame

1. Accuracy of weight/portion size estimation assessed by the absolute weight difference in grams compared with the real food and the number of participants that had within 10% of absolute weight difference or the number of correct counts. 2. Time required to complete the task of weight/portion size estimation for each food using the time from the user entering the food attribute to clicking the 'finished' button measured in milliseconds. Three consecutive meals (i.e., breakfast, lunch, dinner) were measured in a day with 13 food items in total chosen from 25 food items.

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Secondary

Measure	Time frame
User satisfaction assessed by system usability scale score including usable scale and learnable scale open-ended questionnaire opinion for subjective evaluation to collect individual comment or suggestion for recording food portion size through these three types of user interfaces. Following use, perceptions on using the apps were measured in use of the System Usability Scale (SUS). When a SUS is used, participants are asked to score the following 10 items with one of five responses that range from Strongly Agree to Strongly Disagree.	—

Measure

Time frame

User satisfaction assessed by system usability scale score including usable scale and learnable scale open-ended questionnaire opinion for subjective evaluation to collect individual comment or suggestion for recording food portion size through these three types of user interfaces. Following use, perceptions on using the apps were measured in use of the System Usability Scale (SUS). When a SUS is used, participants are asked to score the following 10 items with one of five responses that range from Strongly Agree to Strongly Disagree.

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Countries

Taiwan

Contacts

Public ContactYing Chieh Liu

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 19, 2026