text: Attributes and predictors of long COVID Reports of long lasting coronavirus disease 2019 COVID 19 symptoms the so called long COVID are rising but little is known about prevalence risk factors or whether it is possible to predict a protracted course early in the disease We analyzed data from 4 182 incident cases of COVID 19 in which individuals self reported their symptoms prospectively in the COVID Symptom Study app sup 1 sup A total of 558 13 3 participants reported symptoms lasting 28 days 189 4 5 for 8 weeks and 95 2 3 for 12 weeks Long COVID was characterized by symptoms of fatigue headache dyspnea and anosmia and was more likely with increasing age and body mass index and female sex Experiencing more than five symptoms during the first week of illness was associated with long COVID odds ratio 3 53 2 76 4 50 A simple model to distinguish between short COVID and long COVID at 7 days total sample size n 2 149 showed an area under the curve of the receiver operating characteristic curve of 76 with replication in an independent sample of 2 472 individuals who were positive for severe acute respiratory syndrome coronavirus 2 This model could be used to identify individuals at risk of long COVID for trials of prevention or treatment and to plan education and rehabilitation services 