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Table 2 Results of item analysis. Number and percentage of missing data and of responses at the floor and ceiling (n = 276)

From: Psychometric properties of the 25-item National Eye Institute Visual Function Questionnaire (NEI VFQ-25), Japanese version

Subscale and Item Missing Number (%) Floor Number (%) Ceiling Number (%)
General health: GH    
   5-level health rating 1 (<1) 11 (4) 7 (3)
General vision: GV    
   5-level general vision 2 (<1) 6 (2) 1 (<1)
Near vision: NV    
   Reading normal newsprint 16 (6) 49 (18) 38 (14)
   See well up close 36 (13) 43 (16) 43 (16)
   Finding objects on crowded shelf 78 (28) 31 (11) 47 (17)
Distance vision: DV    
   Going out to movies/plays 88 (32) 72 (26) 37 (13)
   Going down stairs at night 24 (9) 38 (14) 36 (13)
   Reading street signs 11 (4) 27 (10) 53 (19)
Driving: DR    
   Daylight familiar places 169 (61) 43 (16) 39 (14)
   Driving at night 221 (80) 15 (5) 7 (3)
Peripheral vision: PV    
   Seeing objects off to side 6 (2) 8 (3) 47 (17)
Color vision: CV    
   Difficulty matching clothes 27 (10) 5 (2) 158 (57)
Ocular pain: OP    
   Amount pain 1 (<1) 2 (<1) 122 (44)
   Amount time: pain 0 7 (3) 189 (69)
Role limitations: RL    
   Accomplish less 1 (<1) 31 (11) 85 (31)
   Limited in endurance 3 (1) 29 (11) 105 (38)
Dependency: DP    
   Need much help from others 0 32 (12) 143 (52)
   Stay home most of time 1 (<1) 38 (14) 127 (46)
   Rely too much on other's word 0 29 (11) 154 (56)
Social function: SF    
   Seeing how people react 40 (14) 22 (8) 64 (23)
   Visiting others 25 (9) 22 (8) 98 (36)
Mental health: MH    
   Amount true: frustrated 1 (<1) 30 (11) 117 (42)
   Amount true: embarrassment 1 (<1) 31 (11) 134 (49)
   Amount true: no control 2 (<1) 57 (21) 86 (31)
   Amount true: worry 1 (<1) 40 (15) 32 (12)
Optional items    
Near vision: NV    
   Reading small print 6 (2) 53 (19) 36 (13)
   Reading mail/bills accurately 34 (12) 41 (15) 48 (17)
   Shaving/styling hair/makeup 3 (1) 3 (1) 150 (54)
Distance vision: DV    
   Recognizing faces in room 19 (7) 25 (9) 78 (28)
   Participating in sports/outdoors 105 (38) 41 (15) 62 (23)
   Seeing television program 5 (2) 17 (6) 91 (33)