Marshall's study was similar to the one presented in Figure 1.9 in that the test group (Marshall himself and a volunteer) ingested the same solution of H.pylori. Data was collected similarly through the examination of each subject for presence of symptoms. Marshall's study and the study in Figure 1.9 was different in that there were not multiple groups of test subjects, and that there was no control group in his study.
Work Step by Step
Figure 1.9's procedures had each group be given the same treatment, except when noted. Marshall's study has all volunteers (himself and a volunteer) ingest the same H.pylori sample. The procedures had each subject be examined for presence of ulcers. Marshall's study had himself and the volunteer be examined for symptoms of H.pylori activity through endoscopy and biopsies of stomach lining tissue. Unlike in Figure 1.9, which had three study groups, there was only one group in Marshall's study, and there was no control group in his study as well (all subjects were given the H.pylori solution).