Measurement properties of the eight-item abbreviated functional assessment of cancer therapy—breast symptom index and comparison with its 37-item parent measure

Chun Fan Lee, Raymond Ng, Nan Soon Wong, Nan Luo, Yoon Sim Yap, Soo Kien Lo, Whay Kuang Chia, Alethea Yee, Lalit Krishna, Celest Wong, Cynthia Goh, Yin Bun Cheung
Journal of Pain and Symptom Management 2013, 45 (4): 782-91

CONTEXT: The Functional Assessment of Cancer Therapy--Breast Symptom Index (FBSI) is an eight-item instrument extracted from the Functional Assessment of Cancer Therapy--Breast (FACT-B). There has been no formal assessment of this eight-item version.

OBJECTIVES: This study aimed to examine the measurement properties of and comparability between the English and the Chinese versions of the FBSI and to compare it with its parent instrument, the FACT-B, in breast cancer patients in Singapore.

METHODS: This was an observational study of 271 breast cancer patients. Known-group validity of FBSI scores was assessed using four health indicators. Convergent and divergent validity was examined by correlation coefficients between the FBSI and the FACT-B. Responsiveness was assessed in relation to longitudinal changes in performance status. Test-retest reliability was evaluated by the intraclass correlation coefficient. Multiple regression analyses were performed to compare the scores on the two language versions. Receiver operating characteristic curve analyses were used for comparison between the FBSI and the FACT-B.

RESULTS: For both language versions, the FBSI demonstrated known-group validity, convergent and divergent validity, and sufficient test-retest reliability (intraclass correlation coefficient = 0.75-0.77). The English version was responsive to changes in performance status. The Chinese version was responsive to decline in performance status, but there was no conclusive evidence about its responsiveness to improvement in performance status. No practical significant difference was found in the outcomes between the two language versions despite minor difference in one item. The FBSI performed comparably with the FACT-B.

CONCLUSION: The English and Chinese versions of the FBSI are valid and reliable and provide comparable FBSI scores. The English version is responsive to change, whereas the responsiveness of the Chinese version warrants further study.

Full Text Links

Find Full Text Links for this Article


You are not logged in. Sign Up or Log In to join the discussion.

Related Papers

Remove bar
Read by QxMD icon Read

Save your favorite articles in one place with a free QxMD account.


Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"