Construct Validity and Reliability of Indonesian Version of RAND SF-36 Quality of Life Questionnaire in Breast Cancer Patients

Abstract

Background: The number of breast cancer patients in Indonesia is increasing but there are still only a few researches that assess their quality of life. RAND SF-36 is a quality of life instrument that is widely used. In Indonesia, the validity and reliability of the instrument is still under development, especially in breast cancer patients. Various health status questionnaires have been used in physical rehabilitation studies involving patient with pacemaker, but for women with breast cancer, the usefulness of these questionnaires as measures of physical, mental, and social well-being has not been firmly established. Methods: A previously validated RAND SF-36 questionnaire in patients with pacemaker was given to 252 breast cancer survivor community members. We assessed the construct validity and the reliability by referring to its Pearson’s r table value and Cronbach’s α coefficient. Results: One hundred and fourteen breast cancer survivor community members participated and completed all 36 questions of the instrument between September- November 2018. Questions number 2, 28, and 35 showed lower Pearson’s r value (r<0,300) than other questions but still showed r value of >0.1548 indicating that these questions were valid. Cronbach’s α coefficient >0.90 indicated good internal consistency. Conclusions: The Indonesian version of the SF-36 quality of life questionnaire is a suitable instrument and can be used for research in Indonesian breast cancer patients.

The Indonesian Version of SF-36 Questionnaire: Validity and Reliability Testing in Indonesian Healthcare Workers Who Handle Infectious Diseases

“…Based on validity analysis results all of the questions have a significant value <0.001 which indicates that all of the questions are valid. Reliability results also give Cronbach's Alpha value 0,738 (>0,6) so the conclusion shows that the questions are reliable and consistent to measure the mental health domain of healthcare workers [16][17][18] The SF domain wants to see the extent of the impact of physical health or emotional problems on someone's social activities on the past 4 weeks, these social activities are general social activities with family, friends, neighbors or groups and social activities like visiting friends, relatives, etc. The social functioning domain of the SF 36 questionnaire consists of 2 questions.…”

“…In the conclusion for validity and reliability, the physical functioning domain consists of 9 valid questions and 1 non-valid question. After we deleted the non-valid question we conducted the reliability analysis and the results showed that Cronbach's alpha value is 0,767 (>0,6) which is indicated that the 9 questions to measure the PF domain of healthcare workers is valid and reliable [16][17][18] The RP domain consists of 4 questions. The translating questions to measure role physical in Indonesian version can we described as "do you had difficulty to spend all of your time to do some work or other activities?…”

“…Table 2 shows that all questions have a high significant value which is <0.001 this indicates that the instruction or questions is valid and can be understanding by the respondents. Cronbach's alpha value is 0,641 (> 0,6) it means that all questions are reliable and can measure the role emotional domain of healthcare workers consistently [16][17][18] The VT domain can be measure by 4 questions which in the Indonesian version can we described as how the respondents feeling, is they always feel impassioned, have a lot of energy, feel bored, and feel tired quickly. All of this question has a significant value <0.001 which indicated that all of the questions are valid and can be used to measure the vitality domain of respondents.…”

“…Table 2 shows that p-value<0.001 on both questions so that it can be concluded that the two questions to measure the bodily pain domain are valid. While Cronbach's Alpha value is 0.802 (<0.6) so it was considered reliable and consistent [16][17][18] The last domain measured through the SF 36 questionnaire is the GH domain. The questions in this aspect consist of 6 questions, which are questions number 1, 2, 33 to 36.…”

Video-Assisted Breast Surgery (VABS) and Vacuum-Assisted Breast Biopsy (VABB) for Fibroadenoma Mammae on Patients’ Satisfaction: A Preliminary Study

“…Validity and reliability test had been done previously and it is eligible to use for assessing patients' satisfaction level after fibroadenoma surgery. There are numerous types of questionnaire to assess the quality of life of breast cancer patients, such as RAND SF-36 that had been validated in Indonesian version (Ramadhanty et al, 2019). However, there is no questionnaire yet to assess fibroadenoma patient's satisfaction level after surgery (Putra et al, 2020).…”