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Correlation analysis of age and blood level of HTRA1. HTRA1 increased progressively with age in all controls. However, in AMD cases from each country, no correlation was found between blood concentration of HTRA1 and age. Data are presented as scatter plots. The linear regression equations are solid, straight lines. The correlation coefficient (r) and p (two-tailed) values were obtained using linear regression (Pearson's) analysis.
