Author. Year Study design Case ascertainment Location Geo-political zone Setting Mean Age (years) Prevalence % Quality grading
Adebayo et al. 2016 (18) 2007-2011 Hospital-based survey ICD-10, Clinical criteria Lagos South-west Urban 69.6 4.60 Medium
Gureje et al. 2006 (19) 2003-2004 Community-based household survey 10-WDRT Ibadan South-west Peri-urban 74.4 10.10 Medium
Gureje et al. 2011 (20) 2007 Community-based household survey (two-phase study) C-SID Ibadan South-west Peri-urban 74.5 6.94 High
Hendrie et al. 1995 (10, 21) 1992-1993 Community-based household survey (two-phase study) DSM-III-R and ICD-10 Ibadan South-west Peri-urban 81 2.29 High
Hendrie et al. 2001 (22) 1997-1998 Community-based household survey (two-phase study) DSM-III-R, ICD-10 Ibadan South-west Peri-urban 74.2 1.14 High
Ochayi & Thatcher 2006 (23) 2002 Community-based household survey Standardized CSI-D Jos North-central Peri-urban 73 6.40 Medium
Ogunniyi et al. 2016 (24) 2013 Community-based cross‐sectional study DSM‐IV, NINCDS‐ADRDA,, Peterson's criteria Lalupon South-west Rural 70 2.80 High
Yusuf et al. 2011 (25) 2011 Community-based household survey CSI-D, CERAD, SDT, BDS Zaria North-west Urban 75.5 2.80 Medium
Yusuf et al. 2018 (26) 2017 Hospital-based survey CSI-D, CERAD, SDT, BDS Zaria North-west Urban 75 8.24 Medium