Table 3 Results from 5 Studies Investigating H. pylori

Author (Year)	Cohort	Material *H. pylori* marker	*H. pylori* positive (%)
Author (Year)	Cohort	Material *H. pylori* marker	FMS	Controls	p- value
Goebel (2008) [19]	33 FMS 17 CRPS 57 HC	Serum antibodies IgA or IgG	33.0	HC: NT CRPS: 47.0	n.s.
Akkaya (2011) [20]	65 FMS 41 HC	Serum antibodies IgA IgG	30.8 67.7	17.1 43.9	0.169 0.025
Olama (2013) [21]	100 FMS 100 HC	Serum antibodies IgA IgG	50.0 68.0	24.0 32.0	< 0.001 < 0.001
Rodrigo (2013) [22]	104 FMS 125 IBS	Gastroduodenal biopsyH&E + Giemsa staining, polyclonal anti-H. pylori antibody, microbial cultures	42.0	46.0	n.s.
Gezici (2014) [23]	41^# FMS	Gastric biopsy Culture	78.0	–	–

Key: ^# all had dyspepsia; FMS fibromyalgia; HC healthy controls; CRPS chronic regional pain syndrome; IBS irritable bowel syndrome; NT not tested; NA not reported; n.s. not statistically significant.

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