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Table 4 Simple regression analysis of baseline P/A ratios with central retinal thickness, best-corrected visual acuity, and their improvement at 3, 6, 12 months of the follow-up

From: Wide-field swept-source OCT angiography of the periarterial capillary-free zone before and after anti-VEGF therapy for branch retinal vein occlusion

Variables P/A ratio in the first-order artery P/A ratio in the second-order artery
r P r P
Baseline CRT 0.366 0.006 0.377 0.005
CRT improvement
 At 3 months 0.302 0.027 0.310 0.023
 At 6 months 0.312 0.021 0.307 0.024
 At 12 months 0.366 0.007 0.363 0.006
Baseline BCVA − 0.370 0.005 − 0.380 0.004
BCVA improvement
 At 3 months − 0.677 < 0.001 − 0.682 < 0.001
 At 6 months − 0.304 0.026 − 0.287 0.036
 At 12 months − 0.437 0.001 − 0.445 < 0.001
  1. P/A = paCFZ area to artery area; CRT = central retinal thickness; BCVA = best-corrected visual acuity; ETDRS = Early Treatment Diabetic Retinopathy Study