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Table 3 Adjusted odds ratios and 95% confidence intervals for abnormalities in SAQ factors using logistic regression models with forward selection

From: Sleep assessment in a population-based study of chronic fatigue syndrome

Variable* Sleep Apnea Restlessness Non-restorative Insomnia Excessive Daytime Sleepiness
Fatigue group      
   NF 1.0 1.0 1.0 1.0 1.0
   NF|F 3.50 (0.93,13.16) 11.13(2.86,43.26) 1.0 1.0 2.13(0.62,7.32)
   ISF 3.50 (1.22,10.01) 7.91(2.57,24.34) 5.37 (1.73,16.67) 6.25(1.78,21.96) 4.80(1.89,12.21)
   M/P 2.83 (1.02,7.83) 14.19(4.73,42.55) 21.50(7.30,63.38) 12.73(3.80,42.63) 5.26(2.14,12.94)
   CFS-R 2.74 (0.67,11.18) 5.23(1.27,21.57) 13.63 (3.33,55.81) 8.05 (1.69,38.34) 3.48(0.99,12.25)
   CFS 2.06 (0.52,8.23) 16.02(4.17,61.55) 28.10 (7.38,106.99) 9.66 (2.30,40.69) 2.41(0.74,7.82)
Female --- --- --- --- ---
Age (years) --- --- 1.05 (1.02,1.07) --- ---
BMI ---   --- ---  
   <18.5   1.76(0.45,6.84)    2.57(0.70,9.35)
   18.5–24.9   1.0    1.0
   25–29.9   1.44(0.78,2.68)    1.60(0.86,2.98)
   ≥ 30   2.18(1.21,3.91)    2.26(1.27,4.04)
Neck circumference (cm) 1.13 (1.05,1.20) --- --- --- ---
Goodness-of-fit P 0.9244 0.7933 0.0701 1.0000 0.6676
  1. *Fatigue groups were included in all models; other variables entered the models using a forward selection method Hosmer-Lemeshow statistic ---: variable did not satisfy forward selection algorithm NF and NF|F reference for non-restorative sleep and insomnia; NF reference for all other SAQ Factors NF – never fatigued; NF|F – baseline fatigue currently not fatigued; ISF – insufficient symptoms or fatigue for CFS; M/P – medical or psychiatric exclusion; CFS-R – baseline CFS currently remission; CFS – currently CFS