Table 4 Reliability and validity analysis
From: Psychometric properties of the Greek version of the NEI-VFQ 25
Subscale | Number of items | Intraclass correlation coefficients | Cronbach's alpha | Range of item-scale correlations | Convergent validity | Discriminant validity |
|---|---|---|---|---|---|---|
General Health | 1 | 0.841 | NA | NA | NA | NA |
General Vision | 1 | 0.889 | NA | NA | NA | NA |
Ocular pain | 2 | 0.803 | 0.851 | 0.893 – 0.903 | 100 | 100 |
Near activities | 3 | 0.901 | 0.734 | 0.719 – 0.875 | 100 | 100 |
Distance activities | 3 | 0.908 | 0.686 | 0.752 – 0.892 | 100 | 100 |
Vision specific social functioning | 2 | 0.91 | 0.678 | 0.887 – 0.889 | 100 | 100 |
Vision specific mental health | 4 | 0.823 | 0.786 | 0.596 – 0.837 | 100 | 100 |
Vision specific role difficulties | 2 | 0.888 | 0.926 | 0.902 – 0.907 | 100 | 100 |
Vision specific dependency | 3 | 0.826 | 0.848 | 0.835 – 0.899 | 100 | 100 |
Driving | 3 | 0.871 | 0.757 | 0.575 – 0.953 | 100 | 100 |
Color vision | 1 | 0.717 | NA | NA | NA | NA |
Peripheral vision | 1 | 0.84 | NA | NA | NA | NA |