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The relationship between nerve fiber morphology and tear levels of IGFBP-3. (A) Regression analysis revealed a high correlation between nerve fiber length and nerve branch density (R = 0.767, P < 0.001). (B) There was a strong correlation between nerve fiber length and IGFBP-3 (R = 0.522, P = 0.001). (C) There was also a good correlation between nerve branch density and IGFBP-3 (R = 0.481, P = 0.003).
