TABLE 1.

Subject characteristics for controls, all CFS patients, and CFS patient subgroupsa

GroupnAge (yrs)BMI (kg/m2)% (no. in group) with severe CFSSL (min)SE (%)
Controls2437.75 ± 8.5124.10 ± 4.34014.44 ± 17.19 85.77 ± 8.07
All CFS2641.62 ± 8.2024.81 ± 5.1538 (10)24.26 ± 31.43 79.68 ± 10.89*
CFS with FM1544.80 ± 5.6722.64 ± 3.8040 (6)25.33 ± 40.4979.08 ± 11.95
CFS without FM1137.27 ± 9.3426.40 ± 5.5336 (4)22.90 ± 15.3480.43 ± 9.90
  • a Values are means ± standard deviations. SL, sleep latency; SE, sleep efficiency. *, significant difference between control subjects and CFS groups (P < 0.05; t test). Results shown in boldface indicate significant cases.