Thai version of the dry eye-related quality-of-life score questionnaire: preliminary assessment for psychometric properties

Table 3 Median scores of each item and the Cronbach’s alpha of the subscale of the DEQS-Th when each item was deleted

All items and subscales	Median score (range)		Cronbach’s alpha
All items and subscales	Frequency^a	Degree^b	Frequency	Degree
*Bothersome Ocular Symptoms*
1. Foreign body sensation	1.0 (0–3)	1.0 (0–4)	0.75	0.67
2. Dry sensation in eyes	0.5 (0–3)	0.5 (0–2)	0.70	0.58
3. Painful or sore eyes	0.0 (0–2)	0.0 (0–2)	0.79	0.65
4. Ocular fatigue	0.5 (0–3)	0.5 (0–2)	0.74	0.61
5. Heavy sensation in eyelids	0.0 (0–3)	0.0 (0–2)	0.80	0.74
6. Redness in eyes	0.0 (0–1)	0.0 (0–2)	0.79	0.66
*Impact on Daily Life*
7. Difficulty opening eyes	0.0 (0–2)	0.0 (0–2)	0.89	0.89
8. Blurred vision when watching something	1.0 (0–4)	1.5 (0–4)	0.86	0.87
9. Sensitivity to bright light	0.5 (0–3)	0.5 (0–3)	0.88	0.88
10. Problems with eyes when reading	1.0 (0–4)	1.5 (0–4)	0.87	0.87
11. Problems with eyes when watching television, looking at a computer or using a cell phone	1.0 (0–3)	1.0 (0–3)	0.86	0.87
12. Feeling distracted because of eye symptoms	0.0 (0–2)	0.0 (0–2)	0.88	0.88
13. Eye symptoms affecting work	0.0 (0–3)	0.0 (0–3)	0.87	0.88
14. Not feeling like going out because of eye symptoms	0.0 (0–2)	0.0 (0–2)	0.89	0.90
15. Feeling depressed because of eye symptoms	0.0 (0–2)	0.0 (0–2)	0.89	0.90

^a Range from 0 (not at all) to 4 (always), and ^b Range from 0 (not at all) to 4 (very much)

ISSN: 1471-2415