Secondly any variables among subjective sleep, psychiatric, socio demographic and ERG biomarkers that were significantly different between groups or showing a statistical trend (even allowing for interactions between group and other categorical or continuous variables) were then entered into a Backward Stepwise Logistic Regression (BSLR) to assess the combination of these selected variables that best classified individuals for whom we have all the variables as patients with MDE with GSS ≥ 11 or < 11 (method of the BSLR previously detailed in Geoffroy et al.
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A study on electroretinography as a biomarker for seasonal vulnerability in depression.
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