Rehab Clinical Outcome Industry Benchmarks

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I am looking for OP Rehab industry benchmarks for four clinical outcome tools:

Modified Oswestry Low Back Pain Disability Questionaire

Neck Disability Index (NDI)

Lower Extremity Functoinal Scale (LEFS)

Quick Dash (Disability Arm, Shoulder, Hand) 

Can anyone direct me to sources for this information?

Thanks,

Mike Bigelow PT

Colorado Springs, CO