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Table 3 Usability evaluation of the ServAR tool

From: ServAR: An augmented reality tool to guide the serving of food

   Control (n = 30) Information only (n = 30) ServAR tool (n = 30) ANOVA
Questionsa   Mean SD Mean SD Mean SD F (2,89) P
1. How do you evaluate the following properties of the application: The app helped me to estimate the size of a standard serve 2.1 1.0 1.8 1.1 1.7 1.0 1.188 .310
The app worked well 2.2 1.1 2.3 1.0 2.0 0.9 .411 .664
I found it easy to use the app 2.5 1.3 2.4 1.2 2.1 1.1 .925 .400
I found it easy to see the real food underneath the portion image overlay 2.3 1.5 2.4 1.4 2.8 1.4 1.242 .294
2. How do you assess the potential of the application in everyday life: The app will be helpful to educate consumers about the standard serve sizes 1.7 0.9 1.7 1.0 1.7 1.1 .011 .989
The app could help people to control their portion sizes 1.6 0.8 1.6 1.0 1.7 1.0 .084 .919
The app could help people to eat healthier 2.1 0.9 2.2 1.4 1.9 1.1 .366 .694
3. Which features should an app for portion size education have: It should tell me the energy/cal (kJ/kcal) content of the portion 1.8 1.3 2.0 1.5 2.0 1.4 .210 .811
It should adjust with the amount served to tell me the portion size 1.6 0.9 2.1 1.3 2.1 1.3 1.858 .162
  1. SD Standard Deviation
  2. aQuestions answered on a 6-point Likert scale with ‘1’ = strongly agree to ‘6’ strongly disagree; lower score indicates higher agreement with statement. In the context of these questions, the ServAR tool was referred to as the ‘application’ or ‘app’