Table 2 Reliability analysis of Chinese version of Glaucoma Quality of Life-15 item Questionnaire (GQL-15-CHI)
Subscale and item | Item-total scale correlation | Item-subscale correlation | Cronbach α | Intraclass correlation coefficient | Ceiling n (%) | Floor n (%) |
|---|---|---|---|---|---|---|
Central and near vision | 0.75 | 0.73 (0.65-0.79). | 158 (31.10) | 11 (2.17) | ||
Recognizing faces | 0.64 | 0.58 | ||||
Reading newspapers | 0.69 | 0.58 | ||||
Peripheral vision | 0.91 | 0.91 (0.90-0.92) | 143 (28.15) | 3 (0.59) | ||
Seeing objects coming from the side | 0.61 | 0.61 | ||||
Walking on uneven ground | 0.78 | 0.74 | ||||
Tripping over objects | 0.69 | 0.72 | ||||
Judging distance of foot to step | 0.63 | 0.65 | ||||
Walking on steps/stairs | 0.76 | 0.74 | ||||
Bumping into objects | 0.69 | 0.73 | ||||
Glare and dark adaptation | 0.90 | 0.90 (0.88-0.91) | 54 (10.63) | 1 (0.20) | ||
Walking after dark | 0.81 | 0.80 | ||||
Seeing at night | 0.78 | 0.77 | ||||
Adjusting to dim light | 0.69 | 0.70 | ||||
Adjusting to bright light (glare) | 0.56 | 0.54 | ||||
Going from light to dark room or vice versa | 0.72 | 0.73 | ||||
Finding dropped objects | 0.77 | 0.70 | ||||
Outdoor mobility | NA | NA | 249 (49.01) | 15 (2.95) | ||
Crossing the road | 0.77 | 1.00 |