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Table 4 Simple linear regression analysis results of the association between cognition and plasma BDNF levels, IQ, tobacco use and alcohol use in the healthy control group

From: Plasma brain-derived neurotrophic factor levels, learning capacity and cognition in patients with first episode psychosis

  Similarities Digit-symbol coding Logical memory learning curve Verbal paired associates I learning curve Verbal paired associates II
  r 2 ß(P) r 2 ß(P) r 2 ß(P) r 2 ß(P) r 2 ß(P)
BDNF plasma levels −0.026 0.091 −0.011 −0.150 −0.034 −0.012 −0.034 0.010 0.035 −0.260
(0.626) (0.421) (0.947) (0.957) (0.159)
Wechsler Vocabulary (IQ) 0.332 0.591 0.137 0.401 −0.027 0.030 −0.014 −0.115 −0.026 0.044
(0.000) (0.013) (0.859) (0.493) (0.791)
Tobacco use 0.021 0.218 0.086 −0.332 −0.027 −0.027 −0.013 0.122 0.107 0.363
(0.188) (0.042) (0.870) (0.466) (0.025)
Alcohol use −0.052 0.060 0.166 −0.458 −0.043 0.108 −0.042 0.114 −0.033 0.148
  (0.801) (0.042) (0.651) (0.631) (0.534)
  1. r 2: Adjusted R-square; ß: Standardized correlation coefficient.