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Average versus highest intraocular pressure analyses in glaucoma clinical trials
D L DeMill1, Barbara M Wirostko, Lindsay A Nelson
1Department of Ophthalmology, Moran Eye Center, University of Utah, Salt Lake City, Utah, USA.
Ophthalmic Research
|November 7, 2012
Summary
The highest intraocular pressure (IOP) analysis method in glaucoma clinical trials generally yields higher baseline IOPs than the average IOP method. This finding impacts how glaucoma treatment efficacy is evaluated.
Area of Science:
- Ophthalmology
- Clinical Trials
- Glaucoma Research
Background:
- Glaucoma clinical trials often analyze data from both eyes.
- Standardized methods for incorporating bilateral eye data are crucial for accurate treatment evaluation.
- Existing methods for analyzing intraocular pressure (IOP) data may influence trial outcomes.
Purpose of the Study:
- To evaluate statistical methods for treating both eyes as a single variable in glaucoma clinical trials.
- To compare the highest IOP analysis versus average IOP analysis in glaucoma studies.
- To assess the impact of different IOP analysis methods on baseline measurements.
Main Methods:
- Systematic review of clinical trial articles published between January 1995 and April 2011.
- Analysis focused on trials evaluating topical glaucoma medications.
- Comparison of studies using average IOP analysis versus highest IOP analysis.
Main Results:
- Seventeen articles (36 treatment arms) were included, with various topical glaucoma medications.
- Most studies utilized average IOP analysis (24 articles) or highest IOP analysis (12 articles).
- Significant differences in baseline IOP were observed between average and highest IOP analyses, particularly for beta-blockers.
Conclusions:
- The highest IOP analysis method tends to report slightly higher baseline IOPs compared to the average IOP analysis method.
- This difference in baseline measurement can influence the interpretation of treatment effects in glaucoma trials.
- Further research into optimal methods for bilateral eye data analysis in glaucoma is warranted.
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