Table 1

Published studies on incidence of RA

Author	Year published	Period	Region	Incidence/100 000
Den Oudsten³²	1968	1949–63	Rotterdam, The Netherlands	87
Kato¹²	1971	1958–64	Japan	97
Doran⁹	2002	1955–64	Rochester, USA	61
O’Sullivan³³	1972	1968	Sudbury, USA	290
Lawrence³⁴	1977	1959–68	Leigh/Wensleydale, UK	1000
Hochberg⁶	1990	1970–72	UK	240
Jacobsson⁷	1994	1966–73	Pima Indians	890
Doran⁹	2002	1965–74	Rochester, USA	47
Linos¹⁴	1980	1950–74	Rochester, USA	44
Isomäki³⁵	1978	1974–75	Heinola, Finland	42
Shichikawa⁸	1999	1965–75	Kamitonda, Japan	39
Kaipiainen-Seppänen¹⁰	1996	1980	Finland	38
Gran³⁶	1986	1969–81	Lillehammer, Norway	21
Jacobsson⁷	1994	1974–82	Pima Indians	620
Hochberg⁶	1990	1981–82	UK	190
Boyer³⁷	1991	1970–84	Alaska southeast Indians	84
Boyer³⁷	1991	1970–84	Alaska Yupik Eskimos	42
Del Puente²⁴	1989	1969–84	Pima Indians	333
Doran⁹	2002	1975–84	Rochester, USA	46
Shichikawa⁸	1999	1975–85	Kamitonda, Japan	24
Kaipiainen-Seppänen¹⁰	1996	1985	Finland	39
Dugowson¹⁵	1991	1987–89	Seattle, USA	24
Guillemin³⁸	1994	1986–89	Lorraine, France	9
Jacobsson⁷	1994	1983–90	Pima Indians	380
Chan³⁹	1993	1987–90	Worcester, USA	42
Symmons¹⁶	1994	1990	Norfolk, UK	26
Kaipiainen-Seppänen¹⁰	1996	1990	Finland	33
Uhlig⁴	1998	1988–93	Oslo, Norway	26
Doran⁹	2002	1985–94	Rochester, USA	33
Drosos³	1997	1987–95	Northwest Greece	24
Kaipiainen-Seppänen²⁶	2000	1995	Finland	34
Shichikawa⁸	1999	1985–96	Kamitonda, Japan	8
Riise⁴⁰	2000	1987–96	Troms, Norway	29
Söderlin²²	2002	1999–2000	Kronoberg, Sweden	24
Savolainen²¹	2003	2000	Kuopio, Finland	36