Table 2. Summary of other systematic reviews of effectiveness of MT in CTTH.

Author	Type of treatment	n	Results
Espí and Gómez, 201011)	Drugs, manual therapy	15 studies	Joint therapy, functional techniques, with muscle relaxation have good results.
Astin and Ernst, 200222)	Vertebral manipultaion	8 studies	Only 3 treated TTH and do not show conclusive results referring to effectiveness.
Fernández et al., 200623)	Vertebral manipulation, massage, vertebral mobilization, manual traction, cranium therapy	6 studies	Studies using spinal manipulation showed evidence of effectiveness (level 4), while soft tissue techniques showed limited evidence (level 3).
Lenssinck et al., 20044)	Physiotherapy and spinal manipulation	8 studies	Insufficient evidence to support or refute the efficacy of physiotherapy and spinal manipulation in patients with TTH