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...Health care services scarth street email internet healthcare wcbsask com regina saskatchewan online www providers canada sp l tel toll free fax ndi neck disability index howard vernon developed the in was as a modification of oswestry low back pain with permission original author j fairbank and mior published results study reliability validity journal manipulative physiologic therapeutics since then approximately ten articles have appeared indexed literature on all these studies confirmed reports high level we know that consists one factor physical although scores correlate well sf mental component minimum detectable score minimal clinically important difference amounts to same figure points has become standard instrument for measuring self rated due is used by both clinicians researchers each items from maximum obtained can be multiplied two produce percentage occasionally respondent will not complete question or another average other added completed report provided scoring intervals ...