Table 2.

Correlation analysis between performance measures of the N-back tasks in the Letter test and PsyToolkit N-back test.

Performance measure and tasks		Pearson r	P value
Mean response time
	1-back	.78	<.001
	2-back	.71	<.001
	3-back	.53	.01
Number of correct responses
	1-back	.90	<.001
	2-back	.19	.40
	3-back	.35	.13