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Table 3 An overview on the use of blinding, control groups and placebo

From: Myofascial trigger points in migraine and tension-type headache

  Migraine Tension-type headache Total
Blinding 36% (5/14 relevant studies) 79% (15/19 relevant studies) 61% (19/33 relevant studies)
Control group 44% (4/9 relevant studies) 79% (11/14 relevant studies) 65% (15/23 relevant studies)
Placebo 40% (2/5 relevant studies) 80% (4/5 relevant studies) 60% (6/10 relevant studies)