Table 3.

Mean amplitude values and standard deviantions and results of the independent samples t-tests (two-tailed, bootstrapped with 1000 iterations) comparing the response amplitudes between the groups of young and older adults in the later somatosensory and auditory ERP components in response to standard and deviant stimuli.

	Mean amplitude (µV) ± SD		Difference between young adults and older adults
	Young	Older	Mean [SEM]	95% CI	t (df)	p	d
sMMR
std	0.26 ± 0.40	0.26 ± 0.35	<0.01 [0.07]	−0.14 to 0.15	0.01 (117)	0.992	0.02
dev	0.70 ± 0.74	0.42 ± 0.63	0.28 [0.14]	0.01 to 0.56	2.16 (117)	0.043*	0.40
aN1
std	0.62 ± 0.74	−0.16 ± 0.70	0.78 [0.15]	0.48 to 1.08	5.54 (117)	0.001***	1.02
dev	−0.11 ± 0.72	−1.36 ± 0.85	0.25 [0.15]	−0.06 to 0.53	1.57 (117)	0.105	0.30
aP2
std	−0.18 ± 0.45	0.18 ± 0.39	0.36 [0.08]	0.19 to 0.52	4.48 (117)	0.001***	0.83
dev	0.60 ± 0.83	0.43 ± 0.56	0.16 [0.15]	−0.12 to 0.47	1.27 (117)	0.298	0.23

SEM, standard error of mean; SD, standard deviation; CI, confidence interval; d, Cohen’s d; df, degrees of freedom; p, statistical significance; *p < 0.05; **p < 0.01; ***p < 0.001.