Author	Study period	Location	Geopolitical zone	Study design	Case definition	Study Setting	Age range (mean)	Sample	Overall prevalence, CI (%)	Quality
Adeniyi et al. [@144095]	2012	Owo, Ondo State	South-west	Hospital based retrospective study	FEV1/FVC < 0.7	Semi-urban/ Rural	25+ (50.0)	914	7.6	Moderate
Obaseki et al. [@144096]	2012	Ile-Ife, Osun State	South-west	Population-based cross-sectional study	FEV1/FVC < LLN	Semi-urban/ Rural	40+ (53.3)	875	7.7	High
Desalu et al. [@144097]	2009	Ido-Ekiti, Ekiti State	South-west	Population-based cross-sectional study	BMRC criteria or doctor’s diagnosis	Semi-urban/ Rural	35+ (55.5)	391	5.6	Moderate
Desalu et al. [@144098]	2004-2010	Ido-Ekiti, Ekiti State	South-west	Hospital based retrospective study	FEV1/FVC < 0.7	Semi-urban/ Rural	18+ (49.9)	368	10.3	Moderate
Harris-Eze [@144099]	1992	Ibadan, Oyo State	South-west	Population-based cross-sectional study	BMRC criteria or doctor’s diagnosis	Urban	18+ (35.8)	804	2.2	Moderate
Douglas & Katchy [@144101]	2016	Port-Harcourt, Rivers State	South-south	Population-based cross-sectional study	FEV1/FVC < 0.7	Urban	40+ (52.0)	200	9.0	High
Ozoh et al. [@144100]	2012	Idi-Araba, Lagos	South-west	Population-based cross-sectional study	FEV1/FVC < 0.7	Urban	40+ (53.7)	412	5.3	High
Gathuru et al. [@144102]	1999	Benin, Edo State	South-south	Population-based cross-sectional study	FEV1/FVC<0.7	Urban	30-69 (47.0)	270	9.3	High