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Screening Telephone Interviews (19,807 persons enumerated). 79% response. Well (n = 10,834). Unwell (n = 8,973). Fatigued (n = 3,851). Random selection (n = 3,116). Not Fatigued (n = 5,122). Random selection (n = 2,134). 56% response (n = 1,756). 71% response (n = 2,438).
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Screening Telephone Interviews (19,807 persons enumerated) 79% response Well(n = 10,834) Unwell(n = 8,973) Fatigued (n = 3,851) Random selection (n = 3,116) Not Fatigued (n = 5,122) Random selection (n = 2,134) 56% response (n = 1,756) 71% response (n = 2,438) 67% response (n = 1,429) Detailed Telephone Interview (CATI) (n = 5,623) Exclusionary conditions (n = 1,609) Telephone classification: CFS-like (n = 469) Well (n = 1,782) Chronically Unwell (n = 1,763) 62% response (n = 292) Random selection (n = 505) Frequency matched to CFS-like by age, race, sex, and residential area (n = 641) 53% response (n = 268) 35% response (n =223) Exclusionary conditions (n=280); Missing data (n = 2) Completed clinic (n = 783) Clinic Classification: Well (n = 124) ISF (n = 264) CFS (n = 113)