Table 1.

Summary of previous studies that evaluated focal segmental glomerulosclerosis (FSGS) frequency or incidence

Study	Time Period	Location	Type of FSGS	Type of Study	Findings
Haas, M., et al. (1995)1	1974–1993	Chicago, IL	Excluded cases with clear risk factors for secondary glomerulonephritis	Relative disease frequency	FSGS relative frequency increased from 4% during 1974–1979 to 12.2% during 1987–1993
Korbet, S. M., et al. (1996)2	1975–1994	Chicago, IL	Total FSGS	Relative disease frequency	FSGS accounted for 57% of glomerular lesions in blacks and 23% in whites. FSGS relative frequency increased from 39% in 1975–1984 to 64% in 1985–1994 among blacks.
Braden, G. L., et al. (2000)3	1974–1994	Springfield, MA	Total FSGS	Relative disease frequency	Relative frequency of FSGS increased from 13.7% in 1975–1979 to 25% in 1990–1994. The increase was most notable in Blacks and Hispanics with only modest increase in Whites.
Swaminathan, S., et al. (2006)4	1974–2003	Olmsted County, MN	Total FSGS	Population-based	Rate of FSGS increased from 0.1 per 100,000 person years in 1974–1983 to 1.8 per 100,000 person years in 1994–2003
Sim, J. J., et al. (2016)6	2000–2011	Southern California	Total FSGS	Population-based	FSFS was the most common diagnosis (38.9%) across all race and ethnic groups. Incidence rate increased from 1.6 per 100,000 person years in 2000 to 5.3 per 100,0000 person years in 2011
Murugapandian, S., et al. (2016)5	2004–2014	Tuscon, AZ	Total FSGS	Relative disease frequency	FSGS was the most common histopathological diagnosis (22%)
O'Shaughnessy, M. M., et al. (2017)7	1986–2015	Chapel Hill, NC	Total FSGS	Relative disease frequency	Relative frequency of FSGS increased over three decades from 22.6% to 29.7%