BDNF and Tinnitus: Additional analyses in the subsample with complete tinnitus matching data (N = 66), showed that without imputed matching data, tinnitus loudness was still identified as a predictor of hair-cortisol (β = 0.041, VI = 26.18) as well as of hair-BDNF (β = −0.005, VI = 3.11), but with lower variable importance.