TABLE 1.

Questions included from the UK Biobank on fatigue phenotype

Data field	Question
120119	Motivation is lower when fatigued
120120	Exercise brings on fatigue
120121	Easily fatigued
120122	Fatigue interferes with physical functioning
120123	Fatigue causes frequent problems
120124	Fatigue prevents sustained physical functioning
120125	Fatigue interferes with carrying out certain duties and responsibilities
120126	Fatigue is amongst the three most disabling symptoms
120127	Fatigue interferes with work, family or social life