Table 2.

Characteristics of 10 identified population–based studies on rheumatoid arthritis

Author	Country	Setting	Publication year	RA criteria	Cohort size	Prevalence (%)		Prevalence (%, men only)	Prevalence (%, women only)
Abdel-Nasser et al [4]	Egypt	rural	2009	ACR 1987 [4]	5120		0.29	–	–
Beighton et al [34]	South Africa	rural	1975	Rome 1963 [34]	801		0.87	1.60	0.40
Brighton et al [35]	South Africa	rural	1988	Rome 1963 [35]	543		0.00	0.00	0.00
Meyers et al [36]	South Africa	rural	1977	Rome 1963 w/ ARA exclusions [36]	433		2.30	–	–
Meyers et al [32]	South Africa	rural	1982	ARA 1968 [32,36]	127		0.79	–	–
Meyers et al [32]	South Africa	urban	1982	ARA 1968 [32,36]	35		0.57	–*	–
Moolenburgh et al [37]	Lesotho	rural	1986	ARA 1959 [37]	1070		1.80	1.80	1.80
Muller et al [33]	Uganda and Liberia	rural	1972	ARA 1961 [33]	607		2.47	3.10	1.90
Silman et al [38]	Nigeria	rural	1993	ACR 1987 [38]	1994		0.00	0.00	0.00
Solomon et al [39]	South Africa	urban	1975	Rome 1963 [39,40]	551		3.27	2.60	3.70
Truswell et al [41]	Botswana	rural	1968	–	154		0.00	0.00	0.00

RA – rheumatoid arthritis, ARA – American Rheumatism Association