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Table 2 Background variables in the different studies

From: The crossover design for migraine preventives: an analyses of four randomized placebo-controlled trials

AuthorSchrader et al. [11]Tronvik et al. [12]Stovner et al. [13]Hagen et al. [14]All
Publication year2001200320142015
Number included60607272264
Mean age (SD)41.1 (10.2)42.9 (12.0)37.3 (10.7)38.9 (12.3)39.9 (11.5)
Female sex, n (%)50 (83.3)47 (78.3)59 (81.9)63 (87.5)219 (83.0)
Migraine with aura, n (%)27 (45.0)28 (46.7)33 (45.8)23 (31.9)111 (42.0)
Mean BMI (SD)24.3 (4.4)25.3 (4.3)NA124.4 (3.7)24.7 (4.1)
Mean age at first migraine attack (SD)17.1 (7.7)19.6 (9.1)17.9 (10.7)20.1 (9.3)18.7 (9.3)
Mean self-reported frequency of migraine attacks/months (SD)4.3 (1.6)3.7 (1.2)4.8 (3.6)3.6 (1.6)4.1 (2.3)
Mean migraine days/4 weeks (SD)6.6 (3.4)5.7 (2.9)5.3 (3.1)5.3 (2.3)5.7 (2.9)
Mean headache days/4 weeks (SD)9.7 (5.2)8.4 (3.9)8.2 (4.3)6.4 (2.8)8.1 (4.2)
  1. 1Not available
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