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Table 4 Multiple lineal regression analysis for self-reported outcome measures with sex and age as dependent variables in the sample (n = 1086)

From: Unemployment and work disability in individuals with chronic fatigue syndrome/myalgic encephalomyelitis: a community-based cross-sectional study from Spain

  UNIVARIATE   MULTIVARIATE  
Variable n OR (95% CI) p-valuea OR (95% CI) p-valuea
Gender
 Female 978 1.01 (0.68–1.51) 0.959 0.97 (0.56–1.67) 0.906
 Male 108 1   1  
Age range, years
  ≤ 40 253 1   1  
 41–50 428 1.28 (0.94–1.75) 0.123 1.59 (1.04–2.42) 0.031*
  > 50 405 1.70 (1. 23–2.34) 0.001*** 2.21 (1.41–3.46) <  0.001***
Age of pain onset
 Early, ≤ 3 yrs 532 1   1  
 Late, >  3 yrs 520 1.44 (1. 12–1.84) 0.004** 1.49 (0.75–2.95) 0.254
VAS (fatigue/pain)
 Lower 645 1   1  
 Higher 441 2.24 (1.73–2.89) <  0.001*** 2.09 (1.47–2.97) <  0.001***
Cognitive symptoms
 Severe 846 1   1  
 Mild/moderate 61 1.66 (1. 30–2.13) <  0.001*** 0.28 (0.05–1.64) 0.159
 No symptoms 179 0.76 (0.47–1.23) 0.077** 0.60 (0. 37-0.96) 0.033*
Neurological symptoms
 Severe 606 1   1  
 Mild/moderate 451 1.66 (1. 30–2.13) <  0.001*** 1.37 (0.92–2.04) 0.117
 No symptoms 29 0.82 (0.51–1.23) 0.214 11.02 (2. 24–54.29) 0.003**
Autonomic dysfunction
 Severe 412 1   1  
 Mild/moderate 161 2.21 (1.71–2.87) <  0.001*** 0.22 (0.03–1.51) 0.122
 No symptoms 513 0.81 (0. 37–1.76) 0.093 0.57 (0. 38–0.83) 0.004**
Fibromyalgia
 No 464 1   1  
 Yes 601 1.92 (1.50–2.45) <  0.001*** 1.27 (0.87–1.83) 0.214
Ligamentous Hyperlaxity
 No 719 1   1  
 Yes 365 1.45 (1. 12–1.88) 0.005** 1.36 (0.94–1.97) 0.100
SF-36 (physical health)
 Lower 542 1   1  
 Higher 541 0.48 (0. 38–0.62) <  0.001*** 0.45 (0. 31–0.66) <  0.001***
SF-36 (mental health)
 Lower 542 1   1  
 Higher 541 0.66 (0.52–0.84) <  0.001*** 0.50 (0. 33–0.75) <  0.001***
HADS
 No symptoms 250 1   1  
 Mild/moderate 583 1.82 (1. 35–2.45) <  0.001*** 0.90 (0.56–1.44) 0.667
 Severe 240 1.86 (1. 30–2.67) <  0.001*** 1.98 (1. 20–3.26) 0.007**
FIS-40
 Mild/moderate 512 1   1  
 Severe 463 2.61 (2.01–3.39) <  0.001*** 1.27 (0.82–2.04) 0.311
D-FIS-8
 Lower fatigue 563 1   1  
 Higher fatigue 514 2.44 (1.90–3.13) <  0.001*** 1.55 (1.08–2.21) 0.017*
PSQI
 Good sleepers 572 1   1  
 Poor sleepers 446 1.47 (1. 14–1.90) 0.003** 0.98 (0.66–1.48) 0.913
SCL-90-R
 Mild/moderate 90 1   1  
 No symptoms 125 1.1 (0.87–1.91) 0.217 1.30 (1. 15–2.73) 0.571
 Severe 430 1.98 (1.51–2.61) <  0.001*** 1.34 (0.82–2.21) 0.243
  1. CI confidence interval, OR odds ratio, VAS Visual analogue scale, FIS Fatigue impact scale, SF-36 Short form 36-item health survey, HADS Hospital anxiety and depression scale, PSQI Pittsburgh sleep questionnaire index, SCL-90-R Symptom checklist-90-revised
  2. *Significance at 0.05
  3. **Significance at 0.01
  4. ***Significance at 0.001
  5. aData analysis using ANOVA
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BMC Public Health

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