Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Volume of water needed to clear the ear
RCT	26 people, 39 ears	Mean volume of water needed to clear the ear 187 mL with water instillation (ear filled with warm tap water for 15 minutes) prior to syringing 635 mL with no treatment	P = 0.043 Possible bias; for full details see Further information on studies	Effect size not calculated	prior water instillation