Table 4.

Reported limitations of included studies

Reported limitations	References
Limited sample size	[26], [28], [31], [33], [34]
Generalization of the findings is limited	[27], [28], [32], [33], [34], [35]
Short period of learning (Limited timeframe)	[26], [32]
Long-term effects of the study intervention were not measured	[30]
Impossibility of random allocation of individual participants	[30]
Analysis is limited to post-test	[34]
Setting inclusion criteria for sample size	[35]
Not blinding the participants to the intervention	[35]
Unawareness about the technical aspects participants ‘reluctance to use	[29]
The pre-knowledge levels for CPR in the two groups differed	[27]
The app was developed for Android operating system and has not yet be implemented on iOS devices	[26]