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Screening Telephone Interviews (19,807 persons enumerated). 79% response. Well (n = 10,834). Unwell (n = 8,973). Random selection (n = 3,116). Not Fatigued (n = 5,122). Fatigued (n = 3,851). Random selection (n = 2,134). 71% response (n = 2,438). 67% response (n = 1,429).
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Screening Telephone Interviews (19,807 persons enumerated) 79% response Well(n = 10,834) Unwell(n = 8,973) Random selection(n = 3,116) Not Fatigued(n = 5,122) Fatigued(n = 3,851) Random selection(n = 2,134) 71% response (n = 2,438) 67% response (n = 1,429) 56% response (n = 1,756) Detailed Telephone Interview (CATI) (n = 5,623) Exclusionary conditions (n = 1,609) Well (n = 1,782) Chronically Unwell (n = 1,763) CFS-like (n = 469) Telephone classification: Random selection (n = 505) (n = 223 frequency matched to CFS-like by age, race, sex, residential area) 62% response (n = 292) 53% response (n = 268) Completed clinic (n = 783) Exclusionary conditions (n=280); missing data (n = 2)) Clinic Classification: Well (n = 124) ISF (n = 264) CFS (n = 113)