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Table 3 Relative frequencies (“success rates” [%]) of two outcome indicators (visual rehabilitation and refractive accuracy) 2 – 5 weeks after cataract surgery, stratified for presence / absence of each putative external factor, based on the data of three outpatient centres

From: A methodological approach to identify external factors for indicator-based risk adjustment illustrated by a cataract surgery register

  “Refractive accuracy”
│SE – TR │ ≤ 0.5 dpt
“Visual rehabilitation”visual acuity cc ≥ 1.0
Absence Presence Difference Absence Presence Difference
[%] [%] Percentage points [%] [%] Percentage points
Sociodemographic external factors       
Age ≥ 80 years 67.1 69.4 - 2,3 51.6 33.1 18.5
Female gender 67.9 69.6 - 1,7 49.2 45.4 3.8
Quantitatively documented external factors       
Baseline visual acuity cc ≤ 0.1 70.0 59.6 10,4 48.6 34.3 14.3
Severe nearsightedness (myopia; axial eye length ≥ 25 mm) versus normal eye length (22.01 – 24.9 mm) 70.8 58.6 12,2 48.5 47.1 1.4
Severe farsightedness (hyperopia, axial eye length ≤ 22 mm) versus normal eye length (22.01 – 24.9 mm) 70.8 62.5 8,3 48.5 33.6 14.9
Qualitatively documented external factors       
Presence of at least one pre-existing condition (potentially) reducing visual acuity 69.5 67.6 1,9 48.5 33.6 14.9
Presence of at least one known previous ocular surgery 69.0 65.9 3,1 47.6 26.9 20.7
Presence of at least one surgically relevant ocular risk factor 70.0 65.6 4,4 49.0 41.1 7.9
  1. TR: Target refraction, SE: Spherical equivalent 2–5 weeks after cataract surgery.
  2. Visual acuity cc: best-corrected visual acuity 2–5 weeks after cataract surgery.