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Table 2 Morphology of filtering blebs in the study group

From: Deterioration of filtering bleb morphology and function after phacoemulsification

Time after phaco Before Phaco 24 hours 10 days 1 month 6 months 12 months 18 months
Bleb Morphology Surface Small 24% 24% 32% 38% 40% 40% 40%
Medium 36% 58% 60% 58% 54% 54% 54%
Large 20% 18% 8% 4% 6% 6% 6%
Statistical analysis   Z = 0.3 Z = 1.6 Z = 2.5 Z = 2.6 Z = 2.6 Z = 2.6
p = 0.8 p = 0.09 p = 0.01 p = 0.009 p = 0.009 p = 0.009
(Before vs After Phaco)
Elevation Elevated 96% 82% 76% 70% 66% 66% 66%
Flat 4% 18% 24% 30% 34% 34% 34%
Statistical analysis   Z = 2.3 Z = 2.9 Z = 3.4 Z = 3.6 Z = 3.6 Z = 3.6
(Before vs After Phaco)
  p = 0.02 p = 0.004 p = 0.001 p < 0.001 p < 0.001 p < 0.001
  1. Regarded as statistically significant if p < 0,05, (the sign test).
  2. Z – the value of test function for the given test.