Table 1

Characteristics of inclusion studies

First author (publication year)	Study design	Country	Sample size	Mean age/range	Year	Outcome
							(Cantor et al 2018)13	Cross-sectional study	Colombia	1272	>50	2014–2015	POAG
							(Deb et al 2014)24	Cross-sectional study	India	208	HT No: 55.1±7.1 HTN: 55.5±6.2	2010–2012	POAG
(Hulsman 2007)25	Cohort study	Netherlands	5317	OAG No: 68.8±8.8 OAG: 73.3±7.3	1990–1999	OAG
(Ishikawa et al 2011)23	Cross-sectional study	Japan	710	POAG No: 53.4±9.9 POAG: 58.8±10.6	2007	POAG
(Kawasaki et al 2013)21	Cohort study	Australia	2417	OAG No: 64.1±8.5 OAG: 68.2±8.2	2003	OAG
(Kim et al 2012)26	Cross-sectional study	South Korea	1464	POAG No: 63.5±11.6 POAG: 68.4±10.1	2008	POAG
(Kim KE et al 2016)27	Cross-sectional study	Korean	13 831	55.1±0.2	2008–2011	POAG
(Kim H-A et al 2016)14	Cross-sectional study	Korean	8816	≥40	2010–2012	POAG
(Kyari et al 2016)28	Case–control study	Nigeria	13 200	OAG No: 55.4±12.1 OAG: 66.2±12.3	2005–2007	OAG
(Memarzadeh et al 2010)11	Cross-sectional study	American	6130	OAG No: 54.4±10.6 OAG: 65.4±11.7	2008	OAG
(Onakoya et al 2009)15	Case–control study	Nigeria	200	POAG No: 54.7±9.65 POAG: 56.7±12.95	2004	POAG
(Shakya-Vaidya et al 2013)16	Case–control study	Nepal	683	POAG No: 58.54±14.6 POAG: 58.90±14.72	2010–2011	POAG
(Suzuki et al 2006)29	Cross-sectional study	Japan	2874	POAG No: 57.8±11.6 POAG: 63.8±12.0,	2000–2001	POAG
(Tham et al 2018)30	Cross-sectional study	Singapore	9877	POAG No: 63.4±10.8 POAG: 58.2±10.1	2017	POAG
(Topouzis et al 2013)31	Cross-sectional study	Northern Greece	1991	POAG No: 70.35±5.5 POAG: 72.7±6.1	1999	POAG
(Wang et al 2009)17	Cross-sectional study	China	3222	60.4±10.0	2001–2006	POAG

HTN, hypertension; OAG, open-angle glaucoma; POAG, primary open-angle glaucoma.