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Table 1 CFS diagnostic questionnaire.

From: The presence of overlapping quality of life symptoms in primary antibody deficiency (PAD) and chronic fatigue syndrome (CFS)

Delayed prolonged post-exertion malaise after increases in physical, mental and emotional activity3
Non-restorative sleep with frequent difficulty initiating and/or maintaining sleep2
Impaired concentration that is reduced further by external stimuli1
Reduced short term memory with word finding difficulty1
New onset headaches (> 2/month and different in character from previous headaches)1
Sore throat with cervical tenderness/recurrent flu-like episodes1
Arthralgia affecting several joints with stiffness > 1 h but no swelling1
Myalgia affecting multiple groups and exacerbated by mild exertion1
Postural instability feeling unstable on standing, prolonged standing or sitting1
Hypersensitivity to sounds and lights (smells and to a lesser degree taste also)1
  1. Maximum score 13. A score of 8 or more is required for a diagnosis of CFS to be made