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Table 2 Distribution of scale scores

From: Psychometric validation of the visual function questionnaire-25 in patients with diabetic macular edema

Questionnaire and Domain Question number(s) Baseline (week 0) N = 235 Follow-up (week 54) N = 197
   Mean ± SD Median (IQR) Mean ± SD Median (IQR)
VFQ-25: Empirical range is 0 to 100 where a higher score indicates better HRQoL      
1. General Health 1 40.2 ± 22.2 50.0 (25.0-50.0) 40.9 ± 21.0 50.0 (25.0-50.0)
2. General Vision 2 54.6 ± 17.8 60.0 (40.0-60.0) 62.2 ± 15.4 60.0 (60.0-80.0)
3. Ocular Pain 4, 19 78.8 ± 22.3 87.5 (62.5-100.0) 82.2 ± 19.7 87.5 (62.5-100.0)
4. Near Activities 5, 6, 7 58.6 ± 23.8 58.3 (33.3-75.0) 61.0 ± 23.9 58.3 (41.7-83.3)
5. Distance Activities 8, 9, 14 64.2 ± 24.4 66.7 (41.7-83.3) 66.1 ± 25.6 66.7 (50.0-91.7)
6. Social Functioning 11, 13 80.1 ± 23.1 87.5 (62.5-100.0) 78.6 ± 23.2 87.5 (62.5-100.0)
7. Mental Health 3, 21, 22, 25 58.2 ± 27.7 62.5 (37.5-81.3) 64.2 ± 25.2 68.8 (50.0-87.5)
8. Role Difficulties 17, 18 54.8 ± 28.0 50.0 (37.5-75.0) 61.7 ± 27.8 62.5 (37.5-87.5)
9. Dependence 20, 23, 24 70.1 ± 31.2 83.3 (41.7-100.0) 73.7 ± 28.2 83.3 (58.3-100.0)
10. Driving* 15c, 16, 16a 51.8 ± 34.9 58.3 (16.7-83.3) 53.9 ± 35.6 66.7 (16.7-83.3)
11. Colour Vision 12 87.1 ± 21.2 100.0 (75.0-100.0) 87.2 ± 21.5 100.0 (75.0-100.0)
12. Peripheral Vision 10 71.3 ± 25.8 75.0 (50.0-100.0) 74.6 ± 25.4 75.0 (50.0-100.0)
VFQ-25 Composite 1-14, 15c, 16, 16a, 17-25 66.8 ± 18.6 68.8 (53.5-82.8) 70.1 ± 18.7 71.5 (57.2-86.6)
EQ-5D VAS: Empirical range is 0 to 100 where a higher score indicates better health   65.7 ± 16.8 70 (50-80) 67.3 ± 17.0 70 (60-80)
EQ-5D single index   0.748 ± 0.203 0.779 (0.689-0.848) 0.727 ± 0.238 0.727 (0.689-0.850)
  1. Note: Direct comparison between baseline and follow-up data should not be made because the baseline cohort was not restricted to those who also have follow-up data.
  2. * Some patients are no longer currently driving, leading to higher amount of missingness in this subscale: N = 151 at baseline and N = 122 at week 54.