## 2 Materials and Methods
### Gender Analysis Methods  
The Gender Innovation Website presents the 12 most common methods of gender analysis for utilization in scientific technology [4]. The first involves rethinking research priorities and outcomes. This entails reviewing how gender can affect the priorities of future studies. The second involves rethinking concepts and theories. This is a means of considering (a) how the concept and theory of a study can be formed from a gender perspective, (b) which gender hypotheses are implicit in these concepts and theories, and (c) how the concept and theory of gender affects the selection of research subjects and methods and the review and interpretation of the data. The third involves the formulation of research questions. Similar to other research and development processes, re-examining existing research practices with the importance of gender in mind can lead to creative and innovative development. The fourth method involves the analysis of sex. Sex, which distinguishes the biological differences between men and women, plays an important role in prioritizing research, establishing hypotheses, and designing experiments. The fifth method involves the analysis of gender. The ideas that researchers have about gender affect the prioritization of research, the development of research problems, and the selection of research methods. This can lead to stereotypes and prejudices in scientific and engineering research. The sixth method aims to analyze how sex and gender interact. In reality, sex and gender interact to form individual bodies, cognitive abilities, and disease patterns. In turn, the seventh method aims to analyze factors intersecting sex and gender. Factors or variables such as genetic characteristics, age, sex hormones, reproductive state, body composition, physical size, disability status, ethnicity, nationality, geographical location, socioeconomic status, educational background, religion, lifestyle, language, etc. reflect the biological, social, cultural, and psychological aspects of the user and customer. The eighth method relates to engineering innovation processes. By incorporating gender analysis into engineering innovation and technologies, we can develop new products, processes, infrastructure, and services that can promote gender equality and wellbeing and discover new markets and business opportunities. The ninth method relates to health and biomedical research studies. When conducting various types of studies, such as surveys, experimental studies, clinical trials, case studies, etc., sex and gender analysis should be incorporated into many stages of the research design process. The 10 th method is for participatory research and design. This approach analyzes experiences specified by sex and gender. Additionally, the 11 th method requires rethinking standards and reference models. Standards and reference models developed on the basis of research results for specific groups of men and women may lead to erroneous results in their future applications. Finally, the 12 th method involves rethinking language and visual representations. Consideration should be given to whether unconscious assumptions about gender are implicit in metaphors and visual presentations of data, and inclusive language should be used.  
In this study, the fourth method of sex analysis was applied using the same number of voice samples for each sex. The fifth gender analysis was conducted by only setting the voice of the elderly as a target without using the voices of all ages. The characteristics of gender-specific parameters extracted from the voices of elderly female and male groups were analyzed. Finally, to reduce sex and gender bias, we reviewed the standards and reference models by applying the 11 th analysis. Therefore, it is not necessary to utilize all 12 gender analysis methods, but it is important to select and apply them according to the purpose of the research.