Table 1 Measurement items

Perceived Usefulness

 PU1: Using the mHealth services will improve my life quality

Davis (1989) [22, 31], Chau & Hu (2002) [72]

 PU2: Using the mHealth services will make my life more convenient

 PU3: Using the mHealth services will make me more effective in my life

 PU4: Overall, I find the mHealth services to be useful in my life

Perceived Ease of Use

 PEU1: Learning to operate the mHealth services will be easy for me

Davis (1989) [22, 31], Chau & Hu (2002) [72]

 PEU2: I can easily become skillful at using the mHealth services

 PEU3: I can get the mHealth services to do what I want it to do

 PEU4: Overall, the mHealth services are easy to use

Subjective Norm

 SN1. My close friends think that I can use mHealth

Wu and Chen (2005) [73]

 SN2. My close friends think that I should use mHealth

 SN3. My close friends think that I must use mHealth

Personal innovativeness in IT

 PIIT1: If I heard about a new information technology, I would look for ways to experiment with it.

Agarwal and Prasad, (1998) [56], Yi et al. (2006) [74]

 PIIT2: Among my peers, I am usually the first to try out new information technologies.

 PIIT3: In general, I am not hesitant to try out new information technologies.

Intention to Use

 INT1: I have high intention to use the mHealth service

Venkatesh et al. (2003) [46], Davis (1989) [22, 31].

 INT2: I intend to learn about using mHealth services

 INT3: I plan to use mHealth services to manage my health

Actual Use

 ACT1: mHealth service is a pleasant experience

Taylor and Todd (1995) [75], Davis and Venkatesh (2004) [76].

 ACT2: I use mHealth service currently

 ACT3: I spend a lot of time on mHealth service