Association between Helicobacter pylori infection and migraine: A meta-analysis

Table 1 Characteristics of studies on Helicobacter pylori infection in the migraine and control groups

Ref.	Year	Country	Method of detection	Specimen	Grade of reference	H. pylori (+) in migraineurs	H. pylori (+) in controls
Gasbarrini et al[1]	2000	Italy	13C-UBT	Breath	High	70/175	59/152
Pinessi et al[5]	2000	Italy	13C-UBT,	Breath	High	31/103	32/103
			ELISA	Serum
Tunca et al[20]	2004	Turkey	Biopsy	Tissue	High	40/70	20/60
Yiannopoulou et al[6]	2007	Greece	13C-UBT	Breath	Low	30/49	19/51
Hosseinzadeh et al[29]	2011	Iran	ELISA	Serum	Low	39/70	15/70

H. pylori: Helicobacter pylori;

¹³C-UBT: ¹³C urea breath test; ELISA: Enzyme-linked immunosorbent assay.