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| Constructs/items | Sources |
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| Habit | Venkatesh et al. [11], Herrero eta l. [14], Macedo [15], Sheikh et al. [16], Escobar-Rodríguez and Carvajal-Trujillo [17], and Alam et al. [19] |
| (1) Using medical apps has become a habit of mine |
| (2) I believe that medical apps have become important tools in my life |
| (3) Using medical apps comes naturally to me |
| Performance expectancy (PE) |
| (1) Medical apps are helpful in my daily life |
| (2) Using medical apps can satisfy my medical health-care needs |
| (3) Using medical apps can improve my efficiency in monitoring health conditions |
| (4) Using medical apps can improve my health management ability |
| (5) Using medical apps can improve the monitoring of my health conditions |
| Effort expectancy (EE) |
| (1) Learning to use medical apps is very simple for me |
| (2) The interactions with medical apps are clear and easy to understand |
| (3) The operations of medical apps are simple and convenient |
| (4) Medical apps are easy to use |
| (5) I can easily master the skills of using medical apps |
| Social influence (SI) |
| (1) People who are important to me believe that I should use medical apps |
| (2) People who influence my behavior believe that I should use medical apps |
| (3) People whose opinions I value prefer using medical apps |
| (4) People whom I trust believe that I should use medical apps |
| Facilitating conditions (FCs) |
| (1) I have the necessary resources for using medical apps |
| (2) I have the necessary knowledge and skills for using medical apps |
| (3) The medical apps that I am using are compatible with other technologies |
| (4) When I have difficulties using medical apps, I can obtain help from other people |
| Usage intention (UI) |
| (1) I intend to continue using medical apps in the future |
| (2) I will try using medical apps in my daily life |
| (3) I am planning to use medical apps often |
| (4) Overall, I am willing to continue using medical apps |
| Personal innovativeness (PI) | Rogers and Shoemaker [18], Rogers [20], Agarwal, and Prasad [21], Wong et al. [25], Tan et al. [26], and Al-Busaidi [27] |
| (1) When a new technology product or service emerges, I am usually the first among my friends to know about it |
| (2) In the fields in which I am interested, I can always keep up with the developments of the latest technologies |
| (3) if I hear about a new information technology, I look for ways to experiment with it |
| (4) I like to experiment with new information technologies (ITs) |
| (5) When using technologies, I encounter fewer problems than others |
| e-Health literacy | Norman and Skinner [32] and Norman [33] |
| (1) I know what health resources are available on the Internet |
| (2) I know where to find helpful health resources on the Internet |
| (3) I know how to find helpful health resources on the Internet |
| (4) I know how to use the Internet to obtain answers to my questions about health |
| (5) I know how to use health information on the Internet to help me |
| (6) I can rate the health resources on the Internet |
| (7) I can distinguish between high- and low-quality health resources on the Internet |
| (8) I can determine the correctness of health information on the Internet |
| (9) I feel confident in using information from the Internet to make health decisions |
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