"Although one study in Papua New Guinea reported significant efficacy of a 14- and a 23-valent polysaccharide formulation against total mortality and pneumonia mortality among vaccinated children four months to four years of age, the preponderance of evidence suggests that polysaccharide formulations are not effective at preventing pneumonia in children".
https://www.who.int/immunization/SAGE_wg_detailedreview_pneu...

Preponderance:
— most of the people or things in a group (A preponderance of the students in the program came from overseas.).
https://www.macmillandictionary.com/dictionary/american/prep...
— the largest part or greatest amount (The preponderance of evidence suggests that he's guilty.).
https://dictionary.cambridge.org/dictionary/english/preponde...