Combining Transcranial Magnetic Stimulation and Electroencephalography May Contribute to Assess the Severity of Alzheimer's Disease

Table 2

Correlation coefficients (Spearman’s 𝜌) between the P30 amplitude and dementia rating scales.

	Mini-mental state examination	Clinical dementia rating—global^†	Clinical dementia rating—sum of boxes
Left hemisphere	0.456	−0.678^∗∗	−0.788^∗∗∗
Right hemisphere	0.631^∗	−0.705^∗∗	−0.849^∗∗∗
P30mean	0.537^∗	−0.698^∗∗	−0.808^∗∗∗

^∗𝑃<.05, ^∗∗𝑃<.01, ^∗∗∗𝑃<.001.
^†As the global CDR is a classification variable, its correlations with P30 amplitude should be interpreted with care.
Abbreviations:
P30_mean: P30 amplitude, mean of P30 amplitudes on both hemispheres.