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Correlations between sleep efficiency, serum level of proBDNF, and BDNF. (a) Correlation between serum level of BDNF and sleep efficiency. (b) Correlation between serum level of BDNF and proBDNF. In IBD subjects, there were positive correlations between sleep efficiency, serum level of proBDNF, and serum level of BDNF (r = 0.234, p = 0.037 and r = 0.292, p = 0.009), respectively. Abbreviations: BDNF—Brain-Derived Neurotrophic Factor, proBDNF—BDNF precursor.
