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Table 4 OSDI questionnaire and patient subjective symptom evaluation scores at baseline and after cataract surgery

From: Efficacy of 1% carboxymethylcellulose sodium for treating dry eye after phacoemulsification: results from a multicenter, open-label, randomized, controlled study

Subject assessment Treatment group Control group P value*
n Score n Score
OSDI questionnaire score (mean ± SD)
  Baseline 90 41.8 ± 20.8 90 44.8 ± 20.9 0.2116
  At day 7 85 15.6 ± 16.8 85 18.1 ± 19.5 0.4934
  At day 30 83 12.7 ± 11.3 82 14.2 ± 13.8 0.7243
  Change from baseline at day 7 85 −26.7 ± 20.3** 85 −27.2 ± 22.7*** 0.7447
  Change from baseline at day 30 83 −29.9 ± 19.4*** 82 −30.8 ± 20.6*** 0.7748
Subjective symptom evaluation score (mean ± SD)
  Baseline 90 11.8 ± 6.2 90 11.5 ± 6.0 0.7700
  At day 7 85 6.1 ± 5.3 85 6.4 ± 5.2 0.4737
  At day 30 83 5.1 ± 3.6 82 5.6 ± 4.0 0.5971
  Change from baseline at day 7 85 −5.9 ± 5.2** 85 −5.4 ± 5.6*** 0.9018
  Change from baseline at day 30 83 −7.0 ± 4.7** 82 −6.2 ± 5.8*** 0.6069
  1. OSDI, Ocular Surface Disease Index; SD, standard deviation.
  2. *P values for the difference between groups calculated using Wilcoxon rank sum test except for OSDI. Change from baseline at day 30 calculated using t-test.
  3. **P < 0.0001 for change from baseline calculated using Wilcoxon signed rank test.
  4. ***P < 0.0001 for change from baseline calculated using paired t-test.
  5. Significant changes from baseline are indicated in bold font.