Table 1 Participants’ characteristics by illness groups
From: Association of chronic fatigue syndrome with premature telomere attrition
Characteristicsa | All (n = 639) | CFS-X (n = 77, 12%) | CFS (n = 64, 10%) | ISF (n = 302, 47%) | NF (n = 196, 31%) | p-value |
|---|---|---|---|---|---|---|
Age, mean (SEM) | 48.07 (0.38) | 49.99 (1.11) | 47.75 (1.21) | 48.06 (0.58) | 47.44 (0.68) | 0.2725 |
BMI, mean (SEM) | 28.13 (0.21) | 28.29 (0.56) | 28.86 (0.68) | 28.82 (0.32) | 26.77 (0.36) | 0.0003 |
WHR (SEM) | 0.85 (0.00) | 0.85 (0.01) | 0.85 (0.01) | 0.86 (0.004) | 0.83 (0.01) | 0.0025 |
Sex | Â | Â | Â | Â | Â | 0.0009 |
 Female | 477 (74.64%) | 64 (83.12%) | 58 (90.63%) | 222 (73.51%) | 133 (67.87%) |  |
Race | Â | Â | Â | Â | Â | 0.0127 |
 White | 488 (76.37%) | 60 (77.92%) | 51 (79.69%) | 219 (72.51%) | 158 (80.61%) |  |
 Black | 139 (21.75%) | 13 (16.88%) | 10 (15.63%) | 79 (26.16%) | 37 (18.88%) |  |
 Other | 12 (1.87%) | 4 (5.19%) | 3 (4.69%) | 4 (1.32%) | 1 (0.51%) |  |
Residential area | Â | Â | Â | Â | Â | 0.1621 |
 Urban | 216 (33.80%) | 26 (33.77%) | 22 (34.38%) | 109 (36.09%) | 59 (30.10%) |  |
 Metro | 106 (16.58%) | 7 (9.09%) | 7 (10.94%) | 49 (16.23%) | 43 (21.94%) |  |
 Rural | 317 (49.61%) | 44 (57.14%) | 35 (54.69%) | 144 (47.68%) | 94 (47.96%) |  |
Education | Â | Â | Â | Â | Â | <Â 0.0001 |
 Less than High School | 34 (5.33%) | 13 (16.88%) | 2 (3.13%) | 14 (4.65%) | 5 (2.56%) |  |
 ≥ HS ≤ 2 year College | 349 (54.78%) | 51 (66.23%) | 40 (62.50%) | 177 (58.80%) | 81 (41.54%) |  |
 4-year College | 110 (17.27%) | 5 (6.49%) | 7 (10.94%) | 47 (15.61%) | 51 (26.15%) |  |
 Graduate | 144 (22.60%) | 8 (10.39%) | 15 (23.44%) | 63 (20.93%) | 58 (29.74%) |  |
Income | Â | Â | Â | Â | Â | <Â 0.0001 |
 ≤ $20,000 | 78 (12.74%) | 22 (31.88%) | 9 (14.75%) | 41 (14.04%) | 6 (3.16%) |  |
 $20,001–$40,000 | 102 (16.67%) | 9 (13.04%) | 12 (19.67%) | 59 (20.21%) | 22 (11.58%) |  |
 ≥ $40,001 | 432 (70.59%) | 38 (55.07%) | 40 (65.57%) | 192 (65.75%) | 162 (85.26%) |  |
Illness duration in year, mean (SEM)b | 10.99 (0.95) | 9.83 (1.10) | 12.40 (1.61) | Not applicable | Not applicable | 0.1796 |
Post-exertional malaise | ||||||
 Yes | 191 (29.89%) | 65 (84.42%) | 52 (81.25%) | 70 (23.18%) | 4 (2.04%) | < 0.0001 |