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Table 3 Selected risk factors for early eye drop bottle exhaustion among patients who report often, usually, or always running out of drops early (at least 5 times yearly)

From: Prevalence of self-reported early glaucoma eye drop bottle exhaustion and associated risk factors: a patient survey

Factor Yes, runs out No, does not P
Age (yrs) 71.7 ± 11.3 67.1 ± 14.2 .271*
Years of glaucoma drop use 10.9 ± 7.6 7.8 ± 5.8 .070*
Poor visual acuity (≤20/70)    
    Better eye 2/12 (16.7%) 7/224 (3.1%) .070†
    Worse eye 6/46 (13.0%) 6/190 (3.2%) .015†
logMAR visual acuity    
    Better eye .505 ± 1.03 .087 ± .199 .188*
    Worse eye .881 ± 1.06 .397 ± .787 .043*
Visual field    
    Mean deviation (dB), better eye −6.7 ± 7.6 −4.1 ± 5.6 .131*
    Visual Field Index, better eye 81 ± 21 90 ± 16 .198*
    Mean deviation, worse eye −12.0 ± 13.3 −8.4 ± 7.8 .387*
    Visual Field Index, worse eye 63 ± 40 78 ± 23 .228*
Number of comorbid conditions (mean ± SD) 2.8 ± 2.0 2.3 ± 1.8 .274*
Number of prescription medications (not including eye drops) 5.3 ± 5.4 3.2 ± 3.0 .228*
Number of bottles 2.1 ± 1.2 2.1 ± 0.8 .962†
Number of eye drops/day 6.2 ± 4.5 6.6 ± 3.8 .235†
  1. *t-test, 2-tail; †Chi square or Fisher Exact test, 2-tail.