Fate of meta-analyses: The case of Helicobacter pylori

Table 2 Profile and No. of published meta-analyses and systematic reviews on Helicobacter pylori

Topic	Total No. of publications	Meta-analyses	Systematic reviews	Meta-analysis + systematic review
Epidemiology	6	5	1	0
Diagnosis	23	13	4	6
Antibiotic resistance	7	5	2	0
Genetics	32	30	0	2
Eradication regimens	134	98	17	19
Extragastric manifestations	49	35	2	12
Probiotics	11	11	0	0
Peptic ulcer	9	7	1	1
Gastric cancer	16	12	0	4
Pathogenesis	22	21	1	1
Other cancers (oesophagus, colon, pancreas, liver, biliary, lung)	26	24	0	2
Children	8	7	0	1
Methodological issues	12	0	12	0
Traditional Chinese medicine	1	0	0	1
Total	356	268 (75.2%)	40 (11.3%)	48 (13.4%)