Table 4.
CTA adoption rate in each study.
| Adopters (%) | ||||
|---|---|---|---|---|
| Author | Country | Target construct | Potential | Actual |
| Sharma et al. (27) | Public | Intention to install | - | - |
| Walrave et al. (15) | Belgium | Intention to use | 49% | - |
| Altmann et al. (16) | France, Italy, Germany, UK, US | Intention to install | 75% | - |
| Abuh-ammad et al. (22) | Jordan | Intention to use | 72%* | 38%* |
| Kaspar (23) | Germany | Intention to use | - | 50% |
| Jonker et al. (20) | Netherlands | Intention to use | 59-66% | - |
| Thomas et al. (26) | Australia | Intention to download | 19% | 37% |
| Cruz et al. (17) | Brazil | Intention to use | - | - |
| Trang et al. (25) | Germany | Intention to install | - | - |
| Walrave et al. (29) | Belgium | Intention to use | 49% | - |
| Velicia-Martin et al. (24) | Public | Intention to use | - | - |
| Jansen-Kosterink et al. (18) | Netherlands | Intention to use | 41% | - |
| Li et al. (21) | United States | Intention to install | 59% | - |
Potential: the percentage of participants who intended to download or use CTAs, Actual: the percentage of participants who were using CTAs.
*: The potential and actual percentage of adopters are not mutually exclusive.
“-”: Not reported.