These data provide both validation and st and ards for other users and indicate the power of the instrument for detecting change in sample population s. CONCLUSIONS The  ODI  remains a valid and vigorous measure and has been a worthwhile outcome measure .
The behavior of the instrument is incompletely understood , particularly in sensitivity to real change
STUDY DESIGN The Oswestry Disability Index ( ODI ) has become one of the principal condition-specific outcome measures used in the management of spinal disorders .
This review is based on publications using the ODI identified from the authors ' personal data bases , the Science Citation Index , and h and search es of Spine and current textbooks of spinal disorders .
OBJECTIVES To review the versions of this instrument , document methods by which it has been vali date d , collate data from scores found in normal and back pain population s , provide curves for power calculations in studies using the ODI , and maintain the ODI as a gold st and ard outcome measure .
SUMMARY OF BACKGROUND DATA It has now been 20 years since its original publication .
More than 200 citations exist in the Science Citation Index .
Disability and functional status in patients with low back pain receiving workers' compensation: a descriptive study with implications for the efficacy of physical therapy.
BACKGROUND AND PURPOSE The efficacy of a physical therapy outpatient program with multiple interventions to treat low back pain in subjects receiving workers ' compensation was examined . The primary purpose of the study was to describe the level of disability , physical impairment , and rate of return to work for compensated patients . SUBJECTS One hundred thirty-eight patients ( 84 male , 54 female ) , aged 17 to 63 years ( mean = 38 , SD = 10 ) , were evaluated prospect ively . METHODS Subjects were assessed initially ( INA ) and were reevaluated 1 month later ( 1MO ) and again at the time of discharge ( DC ) . The Oswestry disability score , fingertip-to-floor distance during forward bending , maximal isometric lift , and work status were described as outcomes . Subjects were grouped based on compliance , chronicity , and leg symptoms . Each disability/impairment outcome was analyzed with paired t tests ( INA versus 1MO and INA versus DC ) . The frequency of subjects returning to work across groups was evaluated with a chi-square analysis corrected for unequal group sizes . RESULTS Overall , there was improvement in each dependent measure at 1MO and DC compared with the INA . Subjects with high compliance had a 10 % reduction in mean disability at 1MO and a 12 % reduction in mean disability at DC compared with the INA . The low-compliance group , in contrast , showed less than a 5 % reduction in mean disability at both the 1MO and DC assessment s compared with the INA . The magnitude of improvement in disability status , forward bending , and maximal lift was approximately two to three times greater for subjects with acute symptoms compared with those with chronic symptoms . The increase in mean forward bending for subjects without leg symptoms was over twice as large as the increase in forward bending for subjects with leg symptoms . Seventy-five percent of the subjects followed at DC ( 30 out of 40 ) were released to work in some capacity . There was no association between compliance or presence of leg symptoms and work status at DC . Eighty percent of the subjects with acute symptoms , however , were working at the time of DC compared with 44 % of those with chronic symptoms . CONCLUSION AND DISCUSSION Compliance , chronicity , and leg symptoms are all factors that can affect the outcome of physical therapy . The positive outcomes for subjects who complied with therapy suggest that a physical therapy program with multiple interventions may decrease disability and impairment
These data provide both validation and st and ards for other users and indicate the power of the instrument for detecting change in sample population s. CONCLUSIONS The  ODI  remains a valid and vigorous measure and has been a worthwhile outcome measure .
The behavior of the instrument is incompletely understood , particularly in sensitivity to real change
STUDY DESIGN The Oswestry Disability Index ( ODI ) has become one of the principal condition-specific outcome measures used in the management of spinal disorders .
This review is based on publications using the ODI identified from the authors ' personal data bases , the Science Citation Index , and h and search es of Spine and current textbooks of spinal disorders .
OBJECTIVES To review the versions of this instrument , document methods by which it has been vali date d , collate data from scores found in normal and back pain population s , provide curves for power calculations in studies using the ODI , and maintain the ODI as a gold st and ard outcome measure .
SUMMARY OF BACKGROUND DATA It has now been 20 years since its original publication .
More than 200 citations exist in the Science Citation Index .