Table 2.
Item analysis for Cronbach’s alpha
| Question | Mean of total score if deleted | Variance of total score if deleted | Item-total correlation | Alpha if deleted |
|---|---|---|---|---|
| Spirometer concerns | ||||
| The spirometer is easy to use | 58.3 | 58.7 | 0.64 | 0.92 |
| The spirometer display is easy to read | 58.6 | 56.0 | 0.66 | 0.92 |
| The spirometer is reliable and has few technical problems | 58.6 | 56.4 | 0.68 | 0.92 |
| I received adequate training in using my home spirometer | 58.4 | 59.0 | 0.62 | 0.92 |
| The spirometer gives me accurate test results | 58.8 | 59.9 | 0.38 | 0.93 |
| If technical problems occur, the staff are quick to respond and fix the problems | 58.4 | 58.2 | 0.67 | 0.92 |
| The amount of time it takes to complete my daily home spirometry is acceptable | 58.7 | 57.5 | 0.57 | 0.92 |
| Communications/interactions | ||||
| The home monitoring staff are responsive to my questions and concerns | 58.3 | 57.0 | 0.72 | 0.92 |
| My doctors are interested in reviewing my home spirometry tests | 58.9 | 56.8 | 0.39 | 0.93 |
| I am satisfied with amount of communication I receive from the home monitoring staff | 58.5 | 55.0 | 0.75 | 0.92 |
| I am satisfied with the quality of my interactions with the home spirometry staff | 58.3 | 56.4 | 0.78 | 0.92 |
| Programme evaluation | ||||
| I am satisfied with the home spirometry monitoring programme | 58.5 | 56.1 | 0.83 | 0.92 |
| Doing home spirometry makes me feel more secure in detecting problems with my lungs | 58.6 | 55.5 | 0.75 | 0.92 |
| Home spirometry allows me to stay better connected to my health-care providers | 58.7 | 55.3 | 0.72 | 0.92 |
| I would recommend using home spirometry to other patients | 58.5 | 55.1 | 0.80 | 0.92 |