Feng 2012.

Methods	Randomisation by random numbers table Blinding unclear Baseline prognostic factors balanced between treatment groups
Participants	1 centre in China 122 participants; baseline characteristics similar Enrolment within 2 weeks to 6 months of stroke onset Clinical evidence of dysphagia 2 participants lost to follow‐up
Interventions	Rx: tongyan spray (n = 60) C: placebo (n = 60) Treatment for up to 28 days
Outcomes	Outcomes: swallow safety and function using the SSA
Notes	Exclusions: consciousness disorder; unstable life sign and accompanied by serious diseases (heart, kidney, etc.), non‐compliance with examination and treatment
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random numbers table
Allocation concealment (selection bias)	Low risk	Concealed via sealed envelopes
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Blinding unclear
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Blinding unclear
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Blinding unclear
Incomplete outcome data (attrition bias) All outcomes	Low risk	2 participant dropouts (1 from each group)
Selective reporting (reporting bias)	Low risk	All outcomes listed reported
Other bias	Low risk	None identified