Table 2 19 migraine studies included in the meta-analysis with p-value and RR. 11 studies are highlighted in red: p is statistically significant (p < 0.05). Abbreviations: RR – relative risk; LL – lower limit for RR; UL – upper limit for RR; SE – standard error for RR; p-value –– probability value

1

Lisicki M [44]

0,88

0,59

1,33

0,549

5,37%

2

Schram S [45]

0,68

0,53

0,86

0,001

6,14%

3

Aamodt AH [46]

0,90

0,86

0,94

0,000

6,61%

4

Hagen K [36]

0,43

0,27

0,68

0,000

5,12%

5

Misakian AL [47]

0,67

0,57

0,79

0,000

6,39%

6

Luo J [48]

0,74

0,57

0,97

0,031

6,02%

7

Sarker MA [50]

2,71

2,14

3,45

0,000

6,14%

8

Le H [51]

0,70

0,67

0,73

0,000

6,61%

9

Schramm SH 1 [52]

0,62

0,19

2,07

0,436

2,19%

10

Kim BS [53]

0,31

0,10

0,90

0,032

2,51%

11

Gür-Özmen S [54]

1,61

1,03

2,53

0,038

5,16%

12

Yoon MS [55]

0,63

0,58

0,69

0,000

6,56%

13

Kaltseis K [26]

1,42

0,99

2,04

0,055

5,62%

14

Pellegrino Beana C [56]

0,16

0,14

0,18

0,000

6,46%

15

McMurtray AM [57]

0,29

0,09

1,01

0,052

2,11%

16

Lebedeva ER [27]

0,94

0,80

1,11

0,466

6,38%

17

Özcan RK [49]

1,00

0,25

4,00

1,000

1,80%

18

Schramm SH 2 [58]

0,51

0,43

0,60

0,000

6,37%

19

Scher AI [59]

0,60

0,52

0,69

0,000

6,45%

Overall

0,71

0,57

0,89

0,002

100,00%