Table 4.
Cronbach’s alpha coefficients for the different global scales and subscales (‘observed values’ and ‘expected values’) in the Dundee Ready Education Environment Measure (DREEM)
| DREEM | Items | n | CASES | ALPHA |
|---|---|---|---|---|
| Global scale | 50 | 650 | 638 | 0.929 |
| Subscale | ||||
| Subscale I | 650 | 648 | 0.851 (0.832) | |
| Subscale II | 650 | 648 | 0.783 (0,798) | |
| Subscale III | 650 | 644 | 0.725 (0.716) | |
| Subscale IV | 650 | 646 | 0.785 (0.761) | |
| Subscale V | 2 | 650 | 650 | 0.596 (0.580) |
| Global scale—gender | ||||
| Women | 50 | 497 | 489 | 0.930 |
| Men | 50 | 152 | 148 | 0.918 |
| Global scale—year | 50 | |||
| 1st year | 50 | 127 | 121 | 0.924 |
| 2nd year | 50 | 136 | 135 | 0.916 |
| 3rd year | 50 | 124 | 121 | 0.918 |
| 4th year | 50 | 133 | 133 | 0.926 |
| 5th year | 50 | 130 | 128 | 0.939 |
| Global scale—faculty | ||||
| Medical University of Lublin | 50 | 274 | 273 | 0.937 |
| Medical University of Gdańsk | 50 | 376 | 365 | 0.933 |
Items: number of items in the scale or subscale; n: number of questionnaires (participants); cases: number of questionnaires without value lost on which the alpha coefficients were calculated. Cronbach’s alpha ‘expected’ values were calculated using the Spearman–Brown formula. The value in bold is an ‘observed’ value, which is inferior to the ‘expected’ value.