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Table 4 ME/CFS precipitants associated with post-exertional malaise severity in an adjusted model

From: Epidemiological and clinical factors associated with post-exertional malaise severity in patients with myalgic encephalomyelitis/chronic fatigue syndrome

Post-exertional malaise severity quartilesp-valueOR [95% CI]a
Quartile 1Reference 
Quartile 2< 0.0001 
Quartile 30.006 
Quartile 4< 0.0001 
Variables
 Non-infectious precipitants0.511.3 [0.6–2.6]
Infectious precipitants
 Influenza-like illness0.301.4 [0.7–2.8]
 Gastrointestinal0.0065.7 [1.7–19.3]
 Urinary0.552.2 [0.2–30.2]
 Respiratory0.441.5 [0.6–3.8]
  1. Multivariate analysis was performed with ordinal regression. All listed precipitants were included in the initial model and adjusted for previously identified variables (age at disease onset and susceptibility to viral infections). The initial model met the validation conditions: the model differed from the intercept (p = 0.01) and validated the proportional odds assumption (p = 0.23). Age at disease onset (p = 0.03) and susceptibility to viral infections (p = 0.02) remained associated with PEM severity quartiles
  2. aOdds Ratio with 95% Confidence interval