Table 1.

Characteristics of the included studies reporting point prevalence of ME/CFS in European countries.

Reference	Procedure	Settings, Country	Sample, Total (% Women)	Age Range	Case Definition	Prevalence Estimate % (95% CI)	Prevalence Estimate by Gender
Nacul et al., [26]	Electronic search (GPs databases), queries to GPs, clinical review of cases	Primary care, The United Kingdom	143,000 (51%)	Adults, 18 to 64 years old	CDC−1994 CCC−2003	0.20 (0.18 to 0.23) 0.10 (0.09 to 0.12)	Women = 0.31 (0.27 to 0.35) Men = 0.08 (0.06 to 0.10) Women = 0.18 (0.15 to 0.21) Men = 0.04 (0.03 to 0.06)
Lindal et al., [13]	Postal delivery to randomly selected people	Community, Iceland	2471 (57%)	Adults, 19 to 75 years old	CDC−1994	2.2 (not reported)	Women = 3.0% (not reported) Men = 1.1% (not reported)
Rimes et al., [27]	Random selection from the Child Benefit Register	Community, The United Kingdom	842 (not reported)	Adolescents, 11 to 15 years old	CDC−1994	0.1 (not reported)	Not reported

Notes. The design of all included studies was cross-sectional. Figures are presented as accurate (i.e., number of decimals) as reported in the original publication. CCC, Canadian Consensus Criteria; CDC, Centers for Disease Control and Prevention; CI, Confidence Interval; GPs, General Practitioners.