1. showed the maximum concentration. The median concentration for the cases was at the maximum -that is, 90 jg/ml whereas that for the controls, 3-6[tg/ml, was below the cut off value for positivity. A nonparametric rank test'6 showed that the cases had significantly higher antibody concentrations than the controls (p<001). The table shows the proportion of cases and controls defined as positive for H pylori antibody, together with the estimated odds ratio based on a matched-analysis. The overall odds ratio was significant;J.U.N.E.,1991
2. Precancerous conditions;Sipponen, P.; Kekki, M.; Siurala, M.,1986
3. Campylobacter pylori and gastric cancer;Correa, P.; Ruiz, B.,1989
4. The Gastrointestinal Physiology Working Group. Helicobacter pylori and gastritis in Peruvian patients: relationship to socioeconomic level, age and sex;AmJGastroenterol,1990
5. Seroprevalence of Helicobacter pylori infections;Perez-perez, G.I.; Taylor, D.N.; Bodhidatta, L.; Wongsrichanalai, J.; Baze, W.B.; Dunn, B.E.,1990