Patel 2013.

Methods	Single‐centre retrospective cohort study
Participants	Country: India (Gujarat) Setting: in‐hospital Number of individuals: 63 Definition of influenza: laboratory confirmed Influenza type: 2009 influenza A H1N1 virus (H1N1pdm09) Median age (years): 34 (IQR 3 to 69) Male sex: 41 (65%)
Interventions	Groups: CS treatment (n = 39); no CS treatment (n = 24) Type of steroid: methylprednisolone Dose: 40 mg 3 times daily for 1 week, twice daily for 1 week, and once daily for 1 week Route of administration: intravenous Timing of steroid therapy: not reported
Outcomes	Mortality
Risk of bias (Newcastle‐Ottawa Scale)	Selection domain score (max 4): 2 Comparability domain score (max 2): 0 Outcome domain score (max 3): 3
Notes	—