Principal component analysis (PCA) with varimax rotation: final two-component solution and Cronbach's α of each component
| PCA factor loadings | |
|---|---|
| Recall items (n=17): closed-ended and multiple choice response formats (Cronbach's α=0.79) | |
| Told I can freely take part | 0.719 |
| Told I can withdraw anytime | 0.314 |
| Will know the study drug/vaccine | 0.552 |
| Unauthorised person will not know about my participation | 0.372 |
| Told the contact person | 0.540 |
| My participation can be stopped without my consent | 0.420 |
| Will I be paid for taking part | 0.395 |
| How were participants divided into groups | 0.403 |
| At what point can I leave the study | 0.371 |
| Meaning of signing/thumb-printing consent form | 0.390 |
| How I decided to take part | 0.429 |
| What will I receive as compensation | 0.520 |
| What will happen if I decide to withdraw | 0.464 |
| Reason for doing the parent study | 0.393 |
| Which are the study procedures | 0.489 |
| Which are the study activities | 0.617 |
| Which are the main benefits of taking part | 0.390 |
| Understanding items: open-ended response format (n=9; Cronbach's α=0.73) | |
| Describe the function of the study drug/vaccine | 0.647 |
| Mention the name of the contact person | 0.451 |
| Tell what researchers want to find in this study | 0.312 |
| Number of study visits | 0.492 |
| Tell what were done during the study visits | 0.498 |
| Describe how participants were divided | 0.689 |
| Tell the difference between taking part in a study and going to hospital | 0.464 |
| What are the possible unwanted effects of a study drug/vaccine | 0.388 |
| Why were participants given different drugs/vaccines | 0.437 |