Table 7.

Analysis of maintenance of intervention effects in the included studies.

References	Time point of follow-up test	Measured cognitive domain	Measurement	Result
Chu et al., 2014	One month after termination	General cognition	MMSE	While Ex showed no significant decline in MMSE from post-intervention to follow-up, no report on the statistical analysis for Con
Hars et al., 2014a	Three years after termination	General cognition Visuospatial perception	MMSE CDT	No statistical analysis on the cognitive measures and group comparison was conducted Ex and Con showed similar results such as slight decrease in MMSE and slight increase in CDT at follow-up compared to post-intervention
Bugos et al., 2007	Three months after termination	Processing speed/attention Executive function	Digit symbol TMT-B	Improvement in digit symbol and TMT-B from post-intervention to follow-up was observed in Ex, and such changes were significantly different from the Con

Ex, Experimental; Con, Control; MMSE, Mini-Mental State Examination; CDT, Clock Drawing Test; TMT, Trail Making Test.