Table 1.

Prevalence of sporadic IBM in different populations

Study	Region	Diagnostic criteria	Prevalence (per million population)	Prevalence > 50 yrs (per million population)
Lingberg et al. [2]	Sweden	Biopsy and clinical data	2.2	n/a
Kaipiainen-Seppanen and Aho [4]	Finland	Not mentioned	0.9	n/a
Philips et al. [5]	Australia	Griggs et al. criteria	9.3	35.3
Badrising et al. [3]	Netherlands	ENMC criteria	4.9	16
Felice and North (Connecticut, USA) [6]	Connecticut, USA	Griggs et al. criteria	10.7	28.9 (>45 yrs)
Needham et al. [1]	Western Australia	Clinical and biopsy criteria	14.9	51.2
Wilson et al. [7]	Olmsted County, USA	Griggs et al. criteria	71	n/a
Oflazer et al. [8]	Istanbul, Turkey	Own criteria from the study (biopsy and clinical data)	1.0	6.0
Suzuki et al. [9]	Japan	Clinical and biopsy criteria	1.3 (in 1991)	n/a
			9.8 (in 2003)	n/a
Tan et al. [10]	South Australia	Biopsy and clinical data	50.5	139.3