Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
[35] RCT 3-armed trial	270 people; 124 with CTTH, 146 with episodic TTH In review [33]	Proportion of people reporting at least 1 adverse effect 23/132 (17%) with acupuncture 11/63 (17%) with minimal acupuncture	Significance not assessed See Further information on studies