Table 1

Summary of findings: risks of infection, hospital and ICU admission, and death from COVID-19 in people with asthma compared with people without asthma

OutcomeNumber of participants
(studies)
Relative effect
(95% CI)
Certainty
Prevalence: as a proxy for risk of infection83 294
(21 observational studies)
PP: 9.38%
(7.38 to 11.38)
⨁◯◯◯
Very low*
Mortality62 521
(15 observational studies)
OR: 0.9
(0.72 to 1.13)
⨁◯◯◯
Very low†
Hospitalisation25 065
(9 observational studies)
OR: 0.95
(0.71 to 1.26)
⨁◯◯◯
Very low‡
ICU admission13 092
(9 observational studies)
OR: 0.96
(0.75 to 1.24)
⨁◯◯◯
Very low§
  • *Downgraded two levels due to unexplained statistical heterogeneity, one level due to possible publication bias (skewed funnel plot).

  • †Downgraded one level due to unexplained statistical heterogeneity, downgraded one level due to imprecision (wide CIs).

  • ‡Downgraded two levels due to unexplained statistical heterogeneity, downgraded one level due to imprecision (wide CIs).

  • §Downgraded one level due to imprecision (wide CIs).

  • ICU, intensive care unit; PP, pooled prevalence.