Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom relief
Systematic review Crossover design	Children with migraine 3 RCTs in this analysis	Mean headaches per month during 3 months with propranolol with placebo Absolute results not reported	Mean difference –1.38 95% CI –4.41 to +1.65 P value not reported Heterogeneity: I2 = 84%, P value for heterogeneity not reported		Not significant