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Comparison of Statistical Methods for Assessing Spatial Correlations Between Maps of Different Arterial Properties
Journal of Biomechanical Engineering
|July 24, 2015
Summary
Spatial autocorrelation and aggregated data complicate atherosclerosis research. Bootstrap methods revealed wall shear stress correlates with lesion frequency and cell changes, but not arterial permeability in rabbits.
Area of Science:
- Biomedical Engineering
- Cardiovascular Research
- Biophysics
Background:
- Spatial autocorrelation (SA) and data aggregation hinder accurate assessment of biomechanical factors in atherosclerosis.
- Neighboring arterial regions exhibit similar properties, violating independence assumptions in statistical analyses.
- Existing methods for addressing SA are limited, particularly when SA occurs at multiple scales.
Purpose of the Study:
- To develop and validate robust statistical methods for analyzing the relationship between biomechanical factors and atherosclerosis.
- To overcome limitations imposed by spatial autocorrelation and data aggregation in anatomical studies.
- To investigate the correlation between specific biomechanical factors and atherosclerotic development in a preclinical model.
Main Methods:
- Employed Fourier and wavelet transforms to generate autocorrelation-preserving surrogate datasets for null distribution computation.
- Utilized bootstrap methods to circumvent errors introduced by data aggregation.
- Applied these refined statistical techniques to analyze data from immature rabbits.
Main Results:
- The bootstrap technique demonstrated a significant correlation between wall shear stress (WSS) and atherosclerotic lesion frequency.
- Endothelial nuclear elongation was also found to be significantly correlated with WSS.
- No significant correlation was observed between WSS and arterial wall permeability to albumin.
Conclusions:
- Advanced statistical approaches, including bootstrap methods, effectively address spatial autocorrelation and data aggregation challenges in atherosclerosis research.
- Wall shear stress is a significant biomechanical factor associated with early atherosclerotic changes and endothelial cell morphology.
- Arterial wall permeability to albumin is not significantly associated with wall shear stress in this model, suggesting distinct underlying mechanisms.
