Meta-Analysis
Korean J Prev Med. 1999; 32(4): 427-434.
Meta Analysis of Symptom Improvement through Eradication of Helicobacter pylori in Patients with Non-ulcer Dyspepsia.
Sung Jun Kim, Sang Hwa Ohm, Ki Won Jeong, Won Chang Shin, Jong Rae Cho, Hye Suk Shon, and Ki Taek Pae
1Department of Preventive Medicine, Inje University, Korea.
2Department of Internal Medicine, Sanggye Paik Hospital, Korea.
3Department of Clinical Pathology, Sanggye Paik Hospital, Korea.
ABSTRACT
OBJECTIVES: This study was conducted to determine, by reviewing the literature, whether treatment of Helicobacter pylori infection in patients with non-ulcer dyspepsia affects symptoms. METHODS: We retrieved the literature using MEDLINE search, with nonulcer dyspepsia and Hericobacter pylori and treatment as key words, which were reported from 1984 to 1998, and manual literature search. The criteria for inclusion was as follows; 1) The paper should have confirmed nonulcer dyspepsia as case definition. 2) The paper should have performed a randomized, blind trial. 3) Confirmation of Helicobacter pylori eradication should be done 4 weeks after treatment. 4) studies with no information on measurement of symptoms after treatment were not accepted. The percentage of patients with symptom improvement after eradication therapy for Helicobacter pylori infection was calculated. Cumulative odds ratio was compared by fixed effect model and random effect model as sensitivity and funnel plot was used to evaluate publication bias. RESULTS: The overall effect size of symptom improvement was calculated by cumulative odds ratio. Cumulative odds ratio of random effect model was 4.16(95% CI: 1.55-11.19). Before integrating each effect sizes into common effect size, the homogeneity test was conducted and random effect model was selected(Cochran's Q=41.08 (d.f=10, p<0.001)). The heterogeneity across studies was evaluated and the different methodological aspects of studies led to differences between study results. CONCLUSIONS: The results suggest that the eradication of Helicobacter pylori in patients with non-ulcer dyspepsia results more symptom improvement. In studies that shows the opposite results there are methodological aspects explaining the heterogeneity.
Keywords : Helicobacter pylori;Meta analysis;Non-ulcer dyspepsia;Treatment