Table 4.
Descriptive statistics and item-total correlation of the Motivation to Use CPAP Scale (n = 183)
| Factors/item | Item score distribution | Missing data (%) | Mean (SD) | Corrected item–total correlation | Skewness | Kurtosis | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| Strongly agree, n (%) | Agree, n (%) | Undecided, n (%) | Disagree, n (%) | Strongly disagree, n (%) | ||||||
| Factor 1 “Autonomous motivation” | ||||||||||
| 1. I use the CPAP treatment because it makes me feel good. | 104 (58) | 61 (34) | 15 (8) | 0 (0) | 0 (0) | 6.73 | 1.51 (0.65) | 0.579 | 0.917 | − 0.245 |
| 2. I use the CPAP treatment because I want to avoid having apneas. | 132 (68) | 43 (22) | 4 (2) | 2 (1) | 0 (0) | 6.22 | 1.31 (0.57) | 0.631 | 2.02 | 4.974 |
| 3. I use the CPAP treatment because I want to feel more alert. | 132 (68) | 41 (21) | 7 (4) | 1 (1) | 0 (0) | 6.22 | 1.32 (0.57) | 0.679 | 1.81 | 3.138 |
| 4. I use the CPAP treatment because it feels important to use the CPAP. | 102 (53) | 69 (36) | 9 (5) | 1 (1) | 0 (0) | 6.22 | 1.50 (0.62) | 0.755 | 0.99– | 0.666 |
| 5. I use the CPAP treatment because my health is important to me. | 117 (61) | 56 (29) | 7 (4) | 1 (1) | 0 (0) | 6.22 | 1.40 (0.59) | 0.479 | 1.345 | 1.609 |
| 6. I use the CPAP treatment because it feels good to use CPAP. | 68 (35) | 87 (45) | 21 (11) | 3 (2) | 2 (1) | 6.22 | 1.81 (0.79) | 0.550 | 1.112 | 2.104 |
| Factor 2 “Controlled motivation” | ||||||||||
| 7. I use the CPAP treatment because other people say I have to. | 16 (8) | 41 (21) | 53 (28) | 32 (17) | 38 (20) | 6.73 | 3.19 (1.26) | 0.580 | 0.003 | − 1.024 |
| 8. I use the CPAP treatment because the personnel say I have to. | 22 (11) | 46 (24) | 44 (23) | 36 (19) | 32 (17) | 6.73 | 3.06 (1.29) | 0.705 | 0.054 | − 1.093 |
| 9. I use the CPAP treatment because I have to. | 30 (16) | 58 (30) | 42 (22) | 25 (14) | 25 (14) | 6.73 | 2.76 (1.28) | 0.554 | 0.376 | − 0.901 |