Table 1.

Characteristics of the of the included articles

Author	Year of Publication	Sample Size	Study design	Country	Age in Year	Gender	Intervention	Duration of intervention
Cappuccio et al. [1]	2006	I—522 C—491	RCT—cluster randomized design	Ghana	I-54 C−55	M and F	Health education vs control	Daily meeting for the first week—once weekly thereafter.
Azadbakht et al. [2]	2011	I and C—23	RCT—crossover design	Iran	18–30	F	Soy drink vs cow’s milk	6 weeks
Adeyemo et al. [3]	2002	82	RCT	Nigeria	>25	M and F	Reduced salt intake	2 weeks
Hofmeyr et al. [4]	2015	I—1st trial; 1st—181, 2nd—97 C—2nd trial; 1st—186, 2nd—104	RCT	South Africa, Zimbabwe and Argentina	≥18, mean 30.3	F	Calcium tablet	12 weeks (1st trial visit) 24 weeks (2nd trial visit)
Forrester et al. [5]	2005	Nigeria 58, Jamaica 56	RCT—crossover design	Nigeria, Jamaica	25–55	M and F	Low-salt vs high-salt diet	8 weeks (intervention 3 weeks, follow up 2 weeks, washout 3 weeks)
Jessani et al. [6]	2008	200	RCT—crossover design	Pakistan	≥40	M and F	Low sodium vs high sodium	3 weeks (intervention 1 week, follow up1 week, washout 1 week)
Jafar et al. [7]	2010	I 2008 C 2015	RCT—cluster randomized design	Pakistan	May-39	M and F	Health education vs control	3 months

I Intervention group, C control group, M Male, F Female