Subclinical epileptiform activity in the Alzheimer continuum: association with disease, cognition and detection method

Table 3 Comparison of SEA and spike number in AD as found with LTM-EEG, hd-EEG and MEG

	LTM-EEG	HD-EEG	MEG	P-value
SEA	9/48 (19%)	5/26 (19%)	4/16 (25%)	0.879
Number of spikes per 50 min	0.19 [0.17;041]	3 [3;4]	64.5 [7.75;131.5]	0.002^a

Data is reported as number or median with IQR [Q1,Q3], as appropriate. P-values were calculated with Fisher’s exact and Kruskal–Wallis with Mann–Whitney U test and Bonferroni correction if statistically significant differences were found. Significance level was set at 0.05. To calculate the number of spikes per 50 min for LTM-EEG, the calculation as described in the “Methods” Sect. (Formulas) was used
^aMEG versus LTM-EEG: p = 0.015; MEG versus hd-EEG: p = 0.042

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