Variables being investigated	Study	Measurement of medication adherence	Study setting and sample size
Absence of disease symptoms	Campbell et al. [42]	Morisky Green	Nigeria ; N = 262
	Nagarkar et al. [27]	MMAS 8	India; N = 174
	Lubaki et al. [49]	Qualitative	Congo
	Kusuma et al.	Qualitative	India
	Odusola [40]	Qualitative	Nigeria
Presence of hypertension related complications	Ali et al. [46]	MMAS 8 and patient medication chart	Ethiopia; N = 121
Presence of hypertension related complications	Hashmi et al. [57]	History of pill taken and MMAS 4	Pakistan
Family history of hypertension	Bhandari et al. [33]	MMAS 4	Nepal; N = 154
Irregular follow up	Bhandari et al. [33]	MMAS 4	Nepal; N = 154
Irregular follow up	Praveen et al. [30] .	Questionnaire	India; N = 804
Blood pressure control	Boima et al. [26]	MMAS 8	Ghana and Nigeria N = 357
	Lalic et al. [28]	MMAS 8	Serbia; N = 170
	Ramli [54]	The hill bone adherence to BP and MAASA 8	Malaysia; N = 653
	Ali et al. [46]	MMAS 8	Ethiopia; N = 121