Activities of daily living questionnaire The modified Oswestry disability index 25 was utilized. It comprises ten questions that evaluate the capacity of the patient to function doing his daily activities and how the patient rates himself on a scale from A to F. The value of A= 0 and each subsequent letter as an ascending numerical value, B=1 to F=5. The maximum total for all ten questions is 50. The total for all the answers is tabulated and multiplied by two to give a percentage of dysfunction due to lumbar pain.