The phrase "additional information was gathered" is correct and usable in written English.
You can use it when discussing the collection of extra data or details in a report, research, or analysis context.
Example: "After conducting the survey, additional information was gathered to support our findings."
Alternatives: "extra data was collected" or "further details were obtained."
Additional information was gathered from researchers in the field.
Additional information was gathered from interviews with key health personnel, volunteers and local women.
Additional information was gathered from the questionnaire before undergoing colonoscopy: (i) Demographics: age and gender.
During pre-testing, additional information was gathered and some of the questions were modified.
Additional information was gathered from women who identified problems that were new or had reportedly worsened.
Additional information was gathered about participating GPs, so that professional development credit could be recorded.
The process accelerates the allocation effort by iteratively screening plants while additional information is gathered so that incompatible plants can be eliminated from consideration before investing considerable time collecting detailed plant specifications or developing workarounds to incompatible characteristics.
Additional information is gathered by phone or mail.
Total said "additional valuable information" was gathered to prepare for the well control operation and to carry out essential cleaning of key areas around the wellhead, where waxy deposits had accumulated.
Additional exposure information was gathered in three studies.
Additional background information was gathered from individuals outside Turkey with long-standing knowledge of the registries, and this assisted in the development of the topics to be included in interview guides for the key informant interviews [Dr. Brenda Edwards, personal communication; Dr. Joe Harford, personal communication].
