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Table 1 Comparison between pre and postoperative data

From: Evaluation of implanted perforated lacrimal punctal plugs using anterior segment optical coherence tomography

Variable Grade Preoperative
N = 54 (eyes)
Postoperative
N = 54 (eyes)
P value
TMH (µm) Range 632–1420 137–959 < 0.001*
Mean ± SD 936.6 ± 182.3 319.1 ± 204.7
Median 875 253
IQR 810.3–1019.3 209.8–311.5
TMA (mm2) Range 0.11–0.73 0.01–0.5 < 0.001*
Mean ± SD 0.42 ± 0.14 0.07 ± 0.1
Munk grade Grade 0 0 (0%) 6 (11.1%) < 0.001*
Garde 1 0 (0%) 27 (50%)
Grade 2 0 (0%) 14 (25.9%)
Grade 3 26 (48.1%) 5 (9.3%)
Grade 4 28 (51.9%) 2 (3.7%)
Postoperative Munk change Stationary 5 (9.3%)
Improved 49 (90.7%)
  1. Paired samples t-test for parametric quantitative data between the two occurrences
  2. Wilcoxon signed rank test for non-parametric quantitative data and ordinal qualitative data between the two occurrences
  3. TMH tear meniscus height; TMA tear meniscus area; IQR interquartile range
  4. *Significant level at P < 0.05