Table 2. Top 20 upper-middle income country contributors to global health inequalities research (1966–2015), ranked by co-authorship affiliation.

UMIC rank	Global rank	Country of co-authorship affiliation	Volume of health inequalities scientific production (n)	Proportional Co-authorship contribution to global health inequalities scientific production (%)	Health inequalities scientific productivity per GDP per capita	Health inequalities scientific productivity per million population
1	6	Brazil	737	2.17	0.08	3.6
2	16	South Africa	362	1.07	0.06	6.6
3	17	China (ex. H Kong)	347	1.02	0.04	0.3
4	23	Mexico	221	0.65	0.02	1.8
5	28	Iran	129	0.38	0.03	1.6
6	31	Thailand	104	0.31	0.00	1.5
7	35	Argentina	91	0.27	0.01	2.1
8	45	Turkey	68	0.20	0.01	0.9
9	49	Peru	57	0.17	0.01	1.8
10	50	Malaysia	54	0.16	0.01	1.8
11	54	Slovenia	44	0.13	0.00	21.3
12	57	Estonia	40	0.12	0.00	30.4
13	60	Romania	37	0.11	0.00	2.0
14	62	Lebanon	35	0.10	0.00	6.0
15	68	Cuba	27	0.08	0.00	2.4
16	70	Serbia	23	0.07	0.01	3.2
17	71	United Arab Emirates	22	0.05	0.00	2.4
18	78	Bulgaria	18	0.05	0.00	2.5
18	78	Costa Rica	18	0.05	0.00	3.7
20	81	Georgia	15	0.04	0.00	4.1