COVID-19(25) Anxiety(18) Patient(18) 95% CI(15) age(15) Psychiatric(15) collected(15) COVID-19 pandemic(13) mental health(13) Analysis(12) hospital(12) Symptom(12) outcomes(12) individual(12) proportion(12) SARS-CoV-2(12) outcome(12) foundation(12) help(12) participant(9) Cohort(9) greater(9) Insomnia(9) died(9) diagnosed with COVID-19(9) information(9) disorder(9) patients(9) Follow-up(9) Oxford(9)