Table 4

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

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


aReference population: England mid-2008 population (source: Office for National Statistics - http://www.statistics.gov.uk/statbase/product.asp?vlnk = 15106 webcite); 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

Nacul et al. BMC Medicine 2011 9:91   doi:10.1186/1741-7015-9-91

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