Several studies report a negative correlation between P. downsi abundance and fledging success [21], [22], [23], [24].
This is consistent with other studies that report a negative correlation between lymph node yield and increasing age [ 27].
The results of the corresponding analysis performed on children's data are consistent with the findings of the adult study: a negative correlation between proNGF and behavioral indices of cognitive functioning, related to the whole-body cognitive training intervention, was in fact observed.
Consistent with the previous study, our study found a negative correlation between UPDRS motor scores and VMHC in the primary sensorimotor and supramarginal cortex, suggesting deficient inter-hemispheric interaction as a potential mechanism for motor impairment in PD.
Six out of eleven studies showed no difference in CGRP levels, three studies reported a positive correlation, and two studies reported a negative correlation between neuropathic pain and CGRP levels.
This offers an explanation for why some studies find a positive correlation between FA and reading skills10,13, while other studies find a negative correlation between FA and reading skills4,68 within the exact same tracts.
In the last years, many studies observed a negative correlation between gram-negative pathogens and commensal anaerobes, notably Prevotella and Veillonella [3, 10, 66].
However, while these results demonstrate a positive relationship between ER stress and mTOR in apoptosis, other studies suggest a negative correlation between ER stress and mTOR.
Several studies showed a negative correlation between depth to groundwater and nitrate concentration (Changyuan et al. 2004; Enwright and Hudak 2009).
Previous studies revealed a negative correlation between body mass index (BMI) and suicide [ 38, 39].
