Date of Completion


Document Type


Degree Name

Bachelor of Science in Speech Language Pathology


Caffeine, Aged


This systematic review involved a comprehensive search strategy and search criteria adapted from PRISMA (2020) to obtain relevant studies for analysis. Three (3) people cross checked the data separately by applying the interrater reliability to ensure the consistent reliability of data gathering. Four (4) studies were deemed eligible for appraisal using the Newcastle Ottawa Quality Assessment Scale for risk of bias. The outcomes and results of this systematic review were based on the selected studies’ assessments of structural integrity, acoustic characteristics, aerodynamics and perceptual voice characteristics. The review found out that caffeine did not have an effect on an adult’s voice in terms of the aforementioned areas. However, studies showed that there were risks of biases and all studies exhibited methodological limitations, thus affecting the overall reliability of the results gathered in this systematic review.

First Advisor

Larissa Christia F. Adique