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Table 3 Distribution of ME/CFS precipitants according to post-exertional malaise severity quartiles

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

 Quartile 1Quartile 2Quartile 3Quartile 4
Patients, n (%)23 (11.7)74 (37.6)73 (37.1)27 (13.7)
ME/CFS precipitants
 Identified, n (%)18 (78.3)46 (62.2)56 (76.6)19 (70.4)
 Non-infectious, n (%)4 (17.4)17 (23)17 (23)4 (14.8)
 Infectious, n (%)14 (60.9)29 (39.2)39 (53.4)15 (55.6)
  Influenza-like illness10 (43.5)13 (17.6)21 (28.8)7 (25.9)
  Respiratory0 (0.0)9 (12.2)6 (8.2)3 (11.1)
  Gastrointestinal0 (0.0)3 (4.1)3 (4.1)5 (18.5)
  Urinary0 (0.0)1 (1.4)1 (1.4)0 (0.0)