The functional rating index.

The Functional Rating Index (FRI) (Feise and Michael Menke 2001) is a 10-item region-specific Patient Reported Outcome (PRO) measure developed by combining the Neck Disability Index (NDI) and Oswestry Disability Index (ODI). It is designed to reflect status for disorders that involve several or any spine area as a single kinetic chain. The 10 FRI items fall within four constructs – pain, sleep, work, and daily activity – that fit within the three domains of WHO-ICF: 1) Activity limitations daily activity with six items – personal care, travel, recreation, lifting, walking and standing; 2) Impairment with three items and two constructs of pain and sleep – pain frequency, pain intensity and sleep; and 3) Participation restriction with one construct and item – work. It has an approximate completion time of 1 minute and scoring at 20 seconds (Feise and Michael Menke 2001), however percentage conversion may require a computational aid, particularly with missing responses. Being copyright, either permission or a royalty payment is required for its use.