Author(s): Yamada K; Mibu A; Kogo S; Sullivan M; Nishigami T;

This study evaluated the reliability and validity of a Japanese version of Pain Disability Index (PDI). Analyses were conducted on a 7-item version (PDI-J) and a 5-item (PDI-5-J version of the PDI). Using a web-based survey system, we recruited 300 individuals with chronic low back pain (lasting =3 months) and 300 individuals with chronic daily headache ( ...

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