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Table 1 Symptom indices based on selected items from an 86-item general health questionnaire

From: Diverse characteristics of the urinary excretion of amino acids in humans and the use of amino acid supplementation to reduce fatigue and sub-health in adults

General Fatigue Index Pain Index Gastrointestinal Index Sleep Index Vitality Index
Individual scale items
 Low in energy Muscle cramps Abdominal pain Prolonged Sleep Libido
 Trouble concentrating Face pain Diarrhoea Trouble falling asleep Night sweats
 Muscle weakness Neck Pain Constipation Trouble awakening Cravings
 Forgetfulness Shoulder pain Irritable bowel Disturbed sleep  
 Everything an effort Arm pain Gastric reflux Mental fatigue  
 Mental confusion Muscle soreness    
  Heavy limbs