Table 5.

Prognostic factors for training improvement in non-verbal short-term memory

Study	Test for outcome assessment	Dependent variable	Investigated prognostic factor
Multiple regression
			Age	Education	Sex	Neuropsychology	Imaging	Others
Park et al., [7]	Simple Rey Figure Test Immediate copy However, results are reported for “cognitive function” as outcome measure, which is not clearly defined	Change score Post-pre	→	↓*	→	Pre-test scores of neuropsychological tests (Digit Span Test, Spatial Span Test, Categorical Fluency Test, short version of Boston Naming test) →
Correlation analysis
Mohs et al. [21]	Biber Figure Learning Test	Post-test scores, Controlling for pre-test scores	→	→	→			Subjective reported memory →
Group comparisons (ANOVA, t test)
/
Mixed models
/

Studies are sorted according to the statistical method used for obtaining the prognostic factors. ↑ the higher the prognostic factor, the higher the improvement/positive correlation; ↓ the lower the prognostic factor, the higher the improvement/negative correlation; → no direction of effect reported; * significant; x unclear reporting