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Key findings The 12-item Zarit Burden Interview (ZBI-12) was suitable in all situations; the ZBI-7 and the ZBI-6 were almost equally good and may be suitable for palliative care settings; the ZBI-4 and ZBI-1 were useful when a very short screening instrument was needed. The ZBI-22 is a widely used outcome measure of caregiver burden and has been validated in diverse caregiving samples. Several short-form versions of ZBI have been developed, but little is known about how well they perform in
What was known?