Table 1. Summary of included studies.

Study	Health area	Geopolitical region	Study Design	Rigor score (Max = 9)	PPMV characteristics			Shop quality	Knowledge	PPMV practice			Compliance with legal regulation
					Qualification & training	Services	Drug stock, price			Dispensing	Client interaction	Referral
ACTwatch 2009	Malaria	National	Cross-sectional; observation (stocking)	1			X	X	X		X
ACTwatch 2012	Malaria	National	Cross-sectional; observation (stocking)	1	X		X	X	X		X
Adedeji et al. 2011	Malaria	South West	Cross-sectional	1						X
Aguwa et al. 2010	Child illness	South East	Cross-sectional	0	X		X		X	X		X
Ajayi et al. 2002	Malaria	South West	Cross-sectional	1					X	X	X
Akiode et al. 2010	Pharmaco-vigilance	South West; North Central	Cross-sectional	1			X
Akuse et al. 2010	Malaria	North West	Cross-sectional	0	X					X		X
Aniebue et al. 2010	Other	South East	Cross-sectional	0				X	X
Auta et al. 2012	Other	North Central	Cross-sectional	0					X
Awodele et al. 2012	Pharmaco-vigilance	South West	Pre/post	4	X				X
Awofisayo et al. 2008	Pharmaco-vigilance	South South	Cross-sectional	0	X								X
Berendes et al. 2012	Malaria	North West	Cross-sectional	1	X		X		X	X
Brieger et al. 2002	Child illness	South West; South East	Pre/post	3						X
Brieger et al. 2004	Other	South West	Observation (interaction)	1							X	X
Brieger, 2007	Pharmaco-vigilance	South West	Qualitative	0			X
Chukwuocha et al. 2013	Malaria	South East	Cross-sectional	1	X		X		X		X
Ebong et al. 2012	Malaria	South South	Cross-sectional	1					X	X
Enwere et al. 2014	Malaria	South West	Cross-sectional	1					X	X
Erhun and Osagie 2004	Malaria	South West	Cross-sectional	1			X				X
Fajola et al. 2011	Child illness	South West	Cross-sectional; observation (interaction)	1	X						X		X
Fayemi et al. 2010	FP/STIs	South West	Cross-sectional	0	X		X		X			X
FHI360 2013	FP/STIs	South West	Cross-sectional	0	X		X		X				X
Greer et al. 2004	Malaria	South East	Pre/post	7					X	X
Herbert et al. 2013	FP/STIs	South West; North Central	Qualitative	0							X
Idowu et al. 2006	Malaria	South West	Cross-sectional; laboratory analysis	0	X		X	X		X
Jimmy et al. 2000	Malaria	South South	Cross-sectional	0	X		X				X
Livinus et al. 2009	Malaria	North West	Pre/post; mystery client	4	X		X		X	X	X
Mangham et al. 2011	Malaria	South East	Cross-sectional	2	X		X		X		X
Nduka et al. 2013	Malaria	South East	Cross-sectional	1	X		X		X
Obi et al. 2010	TB	South East	Cross-sectional	1	X				X			X
Obitte et al. 2007	Other	South East	Cross-sectional	0	X			X	X				X
Okeke and Uzochukwu 2009	Malaria	South East	Pre/post; client exit interview	3	X				X	X	X
Okeke et al. 2006	Malaria	South East	Qualitative	0	X				X	X	X	X
Okonkwo and Okonkwo 2010	FP/STIs	North Central	Cross-sectional	0		X	X				X		X
Oladepo et al. 2007	Malaria	South West; South East; North Central	Cross-sectional; observation (stocking); qualitative	1	X		X		X
Oladepo et al. 2008	Malaria	South West, South East, North West	Cross-sectional	0			X		X
Oladepo et al. 2011	Malaria	South West; South East; North Central	Cross-sectional; observation (stocking)	1	X		X	X	X		X	X
Onwujekwe 2010b	Malaria	South South	Cross-sectional; client exit interview	0			X
Onwujekwe et al 2009	Malaria	South East	Laboratory analysis	0				X
Onwujekwe et al. 2010	Malaria	South East	Cross-sectional	1	X		X			X	X
Onwujekwe et al. 2011	Malaria	South East	Cross-sectional	2						X
Onyeneho and Chukwu 2010	TB	South West, South East, South South	Cross-sectional; qualitative	1	X				X			X
Oyeyemi et al. 2014	Malaria	South West	Cross-sectional	1	X		X	X					X
Palafox et al. 2012	Malaria	National	Cross-sectional	1			X
Spaid et al. 2011	FP/STIs	National	Qualitative	0							X	X	X
Tekobo et al. 2004	Malaria	South West	Cross-sectional	1	X				X	X			X
Tobin-West and Adeniji 2012	Malaria	South South	Cross-sectional	1	X			X	X	X		X
Ujuju et al. 2014	FP/STIs	South West; South East; North West; North Central	Mystery client; qualitative	2							X	X	X
Um et al. 2007	Malaria	North West	Cross-sectional	1	X				X	X
Uzochukwu et al. 2014	Child illness	South East	Cross-sectional	1							X		X