Table 1

Demographic Characteristics of the U.S. population and the Wichita Sample by Fatigue and Non-Fatigued Group

Demographic Characteristics
U.S. Population*
Wichita Surveillance Groups


Non-Fatigue Group (n = 3,634)
Prolonged Fatigue(n = 2,973)
Suspect CFS§ (n = 512)
CFS (n = 43)

Age, Mean (years)
41.0
40.5
42.7
44.1
47.8
     <35 years (%)
35.6
37.3
29.1
18.9
8.3
     35–49 years (%)
35.2
35.5
38.6
50.6
46.8
     50–69 years (%)
29.2
27.2
32.3
30.6
45.0
Male (%)
49.1
49.3
34.7
29.1
14.6
Female (%)
50.9
50.7
65.3
70.9
85.4
Black (%)
12.1
8.5
11.2
5.5
2.8
Latino (%)
12.6
4.8
5.0
5.7
1.9
Employed (%)
78.4
76.5
64.1
68.4
52.8
Mean Household Income
NA
$33,477
$39,027
$44,143
$40,802
     <$20,000 (%)
26.8
17.7
33.6
24.3
16.8
     $20,000–$49,999 (%)
38.1
40.7
40.0
41.7
46.2
     $50,000–$74,999 (%)
17.8
18.1
12.6
19.1
23.6
     ≥$75,000 (%)
17.4
12.7
6.6
8.2
5.4
     Not Reporting (%)
0.0
10.8
7.1
6.6
8.1
Education (%)





     <12 Years
14.9
7.8
14.8
8.5
2.7
     High School Graduate
31.5
28.4
32.6
33.2
35.6
     Some College
28.2
36.4
35.9
40.0
51.9
     College Graduate (4-Year)
17.3
16.7
8.5
11.1
6.0
     Post Graduate Education
8.2
8.9
5.8
4.7
3.7
     Not Reporting
0.0
1.7
2.4
2.5
0.0
Occupation (%)





     Management or Professional
23.4
27.1
20.3
25.9
16.8
     Clerical Worker
10.3
10.2
12.1
12.8
22.8
     Service Worker
10.6
6.9
9.4
7.4
10.7
     Sales Professional
8.7
6.6
5.2
5.1
7.5
     Technician
2.5
6.6
6.3
5.8
17.0
     Skilled Craftsman
8.3
4.3
5.0
6.3
4.6
     Homemaker
NA
1.9
2.4
2.3
3.5
     Other/Not Reporting
36.2
36.2
39.3
34.4
17.2

* Based on analysis of the March Supplement to the Current Population Survey, 2002 conducted by SRA International, Inc. Columns may not add to 100% due to rounding. Weighted to reflect population of Wichita, Kansas. Columns may not add to 100% due to rounding. Excludes the 555 CFS-like observations. § Excludes the 43 CFS observations.

Reynolds et al. Cost Effectiveness and Resource Allocation 2004 2:4   doi:10.1186/1478-7547-2-4