Table 3

Item analysis
Item
 Missing responses
 Floor responses
 Ceiling responses

Number
 %
 Number
 %
 Number
 %
1. General Health: 5-level health rating
 1
 0.5
 14
 8.9
 6
 3.8
2. General Vision: 6-level general vision
 1
 0.5
 1
 0.6
 6
 3.8
3. Mental Health: Amount true: worry
 2
 1.3
 21
 13.4
 11
 7.0
4. Ocular Pain: Amount pain
 2
 1.3
 1
 0.6
 55
 35.0
5. Near Vision: Reading normal newsprint
 4
 2.5
 21
 13.4
 38
 24.2
6. Near Vision: See well up-close
 1
 0.5
 1
 0.6
 46
 29.3
7. Near Vision: Finding objects on crowded shelf
 1
 0.5
 5
 3.2
 88
 56.1
8. Distance Vision: Reading street signs
 2
 1.3
 6
 3.8
 64
 40.8
9. Distance Vision: Going down stairs at night
 2
 1.3
 2
 1.3
 61
 38.9
10. Peripheral Vision: Seeing objects off to side
 2
 1.3
 1
 0.6
 82
 52.2
11. Social Function: Seeing how people react
 2
 1.3
 2
 1.3
 99
 63.1
12. Color Vision: Difficulty matching clothes
 1
 0.5
 1
 0.6
 101
 64.3
13. Social Function: Visiting others
 1
 0.5
 4
 2.5
 114
 72.6
14. Distance Vision: Going out to movies/plays
 6
 3.8
 56
 35.7
 56
 35.7
15. Driving: Daylight familiar places
 21
 13.4
 84
 53.5
 52
 33.1
16. Driving: At night
 50
 68.2
 1
 0.6
 12
 7.6
17. Role Limitation: Accomplish less
 8
 5.1
 6
 3.8
 53
 33.8
18. Role Limitation: Limited in endurance
 10
 6.4
 6
 3.8
 53
 33.8
19. Ocular Pain: Amount time: pain
 8
 5.1
 1
 0.6
 73
 46.5
20. Dependency: Stay home most of time
 6
 3.8
 14
 8.9
 80
 51.0
21. Mental Health: Amount true: frustrated
 9
 5.7
 11
 7.0
 76
 48.4
22. Mental Health: Amount true: no control
 12
 7.6
 6
 3.8
 84
 53.5
23. Dependency: Rely too much on other's word
 12
 7.6
 4
 2.5
 92
 58.6
24. Dependency: Need much help from others
 10
 6.4
 6
 3.8
 89
 56.7
25. Mental Health: Amount true: embarrassment
 9
 5.7
 8
 5.1
 100
 63.7

Labiris et al. BMC Ophthalmology 2008 8:4   doi:10.1186/1471-2415-8-4