Table 1.
Latent and manifest variables included in the partial least squares model
| Latent Variable | Manifest Variable |
|---|---|
| Drug delivery satisfaction | Satisfaction: I get the same amount of medicine delivered to my lungs each time. |
| Satisfaction: I do not need to breathe in hard to inhale my medicine. | |
| Satisfaction: Low/no irritation in mouth and throat. | |
| Satisfaction: I do not need to breathe in at the same time as I press my inhaler. | |
| Device functionality satisfaction | Satisfaction: The instructions are simple and easy to use. |
| Satisfaction: It is built to last and will not break easily. | |
| Satisfaction: No need for me to put the medicine in the inhaler before I use it. | |
| Satisfaction: Easy to hold and carry around with me. | |
| Satisfaction: Can reuse the inhaler for more than one month. | |
| Device feedback satisfaction | Satisfaction: It tells me how many doses of medicine I have left. |
| Satisfaction: The inhaler locks when empty so it cannot be used anymore. | |
| Satisfaction: It tells me when my dose of medicine has been inhaled correctly. | |
| Comorbid allergic rhinitis | Physician-reported concomitant allergic rhinitis |
| Treatment adherence | MMAS-8 |
| Smoking history | Whether patient ever smoked (clinician-reported) |
| Clinician-reported cigarettes smoked per day | |
| Clinician-reported years smoked cigarettes for | |
| Clinical outcomes | Clinician-reported number of asthma exacerbations in preceding 12 months |
| ACT score | |
| JSEQ score | |
| EQ-5D-3L score |
ACT, Asthma Control Test; EQ-5D-3L, EuroQol-5D-3L; JSEQ, Jenkins Sleep Evaluation Questionnaire; MMAS-8; Morisky Medication Adherence Scale