Alcohol intolerance and myalgic encephalomyelitis/chronic fatigue syndrome

Table 1 DePaul symptom questionnaire-2 questions used to classify alcohol intolerance

Question	Response options
Severity: Throughout the past 6 months, how much has alcohol intolerance bothered you?	0 = symptom not present
	1 = mild
	2 = moderate
	3 = severe
	4 = very severe
Over the last 6 months, did you avoid alcohol due to an alcohol intolerance (feeling sick after drinking alcohol)?	Yes
	No, I drank alcohol
	No, I do not drink alcohol for other reasons
If you were to drink alcohol, how severe would the intolerance be?	0 = symptom not present
	1 = mild
	2 = moderate
	3 = severe
	4 = very severe