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Table 1 Characteristics of Study Population by CFS-related Health Status Classificationa

From: The economic impact of chronic fatigue syndrome in Georgia: direct and indirect costs

Sample ALL CFS ISF NF
Unweighted Number of Individuals 500 112 264 124
Estimated prevalence in sampled population (%) 100 4.9 52.1 43.0
Sex Weighted Column Percent
  ALL CFS ISF NF
Female 44.5 56.5 47.9 39.1
Male 55.5 43.5 52.2 60.9
Race Weighted Column Percent
  ALL CFS ISF NF
White, Non-Hispanic 65.4 65.2 55.8* 77.1
Black, Non-Hispanic 27.8 24.6 33.5* 21.2
Other 6.8 10.3 10.7* 1.7
Age Group Weighted Column Percent
  ALL CFS ISF NF
18 to 29 38.0 11.3 43.6 34.3
30 to 39 23.9 26.6 19.9 28.4
40 to 49 18.2 28.6 19.9 15.0
50 to 59 19.9 33.6 16.6 22.3
Age Weighted Years
  ALL CFS ISF NF
Mean 35.8 43.0** 34.6 36.4
Standard Deviation 12.58 5.15 12.8 15.9
Marital Status Weighted Column Percent
  ALL CFS ISF NF
Married 54.1 62.5 55.2 51.8
Not Married 45.9 37.5 44.8 48.2
Education Weighted Column Percent
  ALL CFS ISF NF
College degree or higher 31.0 26.8 31.3 31.2
Less than a college degree 69.0 73.2 68.7 68.8
Local Market Conditions (Sampling Stratum)  
  ALL CFS ISF NF
Metro 19.6 20.3 18.9 20.4
Urban 32.6 29.4 44.8 18.2
Rural 47.8 50.4 36.3 61.5
Health Insurance Weighted Column Percent
  ALL CFS ISF NF
Any Private 74.6 77.2 66.7 85.5
Public Only 4.5 8.6 1.4 8.2
None 20.9 14.2 31.9 6.3
Employment/Earnings Weighted Percent and Weighted Means
  ALL CFS ISF NF
Employment Status: % Who Worked at all in last 4 weeks 78 71 65 95
Annual Earnings† $28,188 $23,076 $23,856 $33,888
  1. a All 500 participants reported gender, race, age, and stratum, 463 reported health insurance status.* ISF different than NF (2-sided T-test, alpha = 0.05), ** CFS different than non-CFS (ISF+NF) (2-sided T-test, alpha = 0.05). All estimates weighted to reflect sampling probabilities. †Computed by multiplying reported 4-week earnings by 13.