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Table 4 Crude, directly standardised and adjusted prevalence rates of ME/CFS

From: Prevalence of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) in three regions of England: a repeated cross-sectional study in primary care

GP Practices ME/CFS cases (n) Population 18 - 64 years old Crude prevalence rates (%) Directly standardised prevalence ratesa (%) Prevalence rates adjusted by response ratesb (%)
  T T T M F T (95% CI) M (95% CI) F (95% CI) T M F
All practices 219 143,153 0.15 0.06 0.25 0.15 0.13 - 0.17 0.07 0.05 - 0.09 0.23 0.20 - 0.26 0.20 0.09 0.30
London 32 33,047 0.10 0.02 0.18 0.10 0.07 - 0.14 0.02 0.01 - 0.06 0.18 0.12 - 0.26 0.31 0.13 0.48
East Anglia 71 28,026 0.25 0.10 0.41 0.24 0.19 - 0.30 0.11 0.06 - 0.19 0.36 0.27 - 0.46 0.25 0.15 0.36
East Yorkshire 116 82,080 0.14 0.06 0.23 0.14 0.11 - 0.17 0.06 0.04 - 0.10 0.20 0.16 - 0.25 0.14 0.05 0.20
  1. aReference population: England mid-2008 population (source: Office for National Statistics - http://www.statistics.gov.uk/statbase/product.asp?vlnk%20=%2015106); bAssumption: The respondents and non-respondents have proportionally the same number of ME/CFS cases; T, Total; M, male; F, female; based on 29 GP clinics