This is the 11665th most frequent Portuguese word.
pertinentes
Relevant; applicable.
Here, 'pertinentes' is used as an adjective describing data that is related to or important for the research topic.
Os dados apresentados são pertinentes ao tema da pesquisa.
The presented data are relevant to the research topic.
In this case, 'pertinentes' describes the questions as being appropriate and related to the subject being discussed.
Não fiz perguntas fora de contexto, apenas questões pertinentes.
I didn't ask any out-of-context questions, only relevant ones.
'Pertinentes' in this sentence modifies 'observations', indicating that they were significant and applicable to the project.