Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Successful irrigation (syringing)
Systematic review	106 people Data from 1 RCT	Successful syringing with turpentine oil/chlorbutanol/parachlorbenzene/arachis oil proprietary preparation with almond oil/arachis oil/rectified camphor oil proprietary preparation Absolute results not reported	Reported as not significant P value not reported		Not significant
Systematic review	275 people 3 RCTs in this analysis	Successful syringing 93/136 (68%) with dioctyl sodium sulphosuccinate-based softener 98/139 (70%) with maize oil base or olive oil-based softener	OR 0.6 95% CI 0.2 to 2.4		Not significant