1. McDermott MM, Greenland P, Liu K, et al. Leg symptoms in peripheral arterial disease. JAMA. 2001; 286:1599 - 1606.
2. McDermott MM, Greenland P, Liu K, et al. The ankle brachial index as a measure of leg functioning and physical activity in peripheral arterial disease. Ann Intern Med. 2002;136:873-883.
3. McDermott MM, Liu K, Guralnik JM. et al. The ankle brachial index independently predicts walking velocity and walking endurance in peripheral arterial disease. J Am Geriatr Soc. 1998;46:1355-1362.
4. Boyd AM. The natural course of arteriosclerosis of the lower extremities. Proc R Soc Med. 1962 ;55:591 -
5. Imparato AM, Kim GE, Davidson T, et al. Intermittent claudication: its natural course. Surgery. 1975; 78:795-799.
6. McAllister FF. The fate of patients with intermittent claudication managed non-operatively. Am J Surg. 1976; 132:593 - 595.
7. Braunwald E. Fauci AS, Kasper DL, et al. eds. Harrison's Principles of Internal Medicine. 15th ed. New York, NY: McGraw-Hill Professional; 2001.
8. Braunwald E, Zipes DP. Libby P, eds. Heart Disease: A Textbook of Cardiovascular Medicine. 6th ed. Philadelphia, Pa: Saunders; 2001:1467.
9. Ouriel K. Peripheral arterial disease. tancet. 2001; 358:1257-1264.
10. Weltz JI, Byrne J, Clagett P, et al. Diagnosis and treatment of chronic arterial insufficiency of the lower extremities: a critical review. Circulation. 1996;94:3026-3049.
11. Olin JW. The clinical evaluation and office based detection of peripheral arterial disease. In: Hirsch AT, Olin FW, eds. An office-based approach to the diagnosis and treatment of peripheral arterial disease, I: he epidemiology and practical detection of peripheral arterial disease. Am ] Med Continuing Education
2. Series. 1998;10-17.
12. Newman AB, Siscovick DS, Manolio TA, et al. Ankle-arm index as a marker of atherosclerosis in the Cardiovascular Health Study. Circulation. 1993;88:837-845.
13. Ogren M, Hedblad B, Isacsson SO, et al. Ten year cerebrovascular morbidity and mortality in 68 year old men with asymptomatic carotid stenosis. BMJ. 1995;310:1294-1298.
14. Bernstein EF, Fronek A. Current status of noninvasive tests in the diagnosis of peripheral arterial disease. Surg Clin North Am. 1982;62:473-487.
15. McDermott MM, Criqui MH, Liu K, etal. The lower ankle brachial index calculated by averaging the dorsalts pedis and posterior tibial arterial pressures is most closely associated with leg functioning in peripheral arterial disease. J Vasc Surg. 2000;32:1164-1171.
16. Hiatt WR, Hoag S, Hamman RF. Effect of diagnostic criteria on the prevalence of peripheral arterial disease. Circulation. 1995;91:1472-1479.
17. Criqui MH, Denenberg JO, Bird CE, et al. The correlation between symptoms and non-invasive test resuits in patients referred for peripheral arterial disease testing. Vasc Med. 1996;1:65-71.
18. Rose GA. The diagnosis of ischaemic heart pain and intermittent claudication in field surveys. Bull World Health Organ. 1962;27:645-658.
19. Guralnik JM, Fried LP, Simonsick EM, et al. The Women's Health and Aging Study: Health and Social characteristics of Older Women With Disability. Bethesda, Md: National Institute on Aging; 1995. NIH publication 95-4009, Appendix E.
20. AItman R, Alarcon G, Appelrouth D, et al. The American College of Rheumatology criteria for the classification and reporting of osteoarthritis of the hip. Arthritis Rheum. 1991 ;34:505-514.
21. AItman R, Asch E, Bloch D, et al. Development of criteria for the classification and reporting of osteoarth itis. Arthritis Rheum. 1986;29:1039-1049.
22. Ettinger WH, Fried LP, Harris T, et al. Self-reported causes of physical disability in older people. ] Am Geriatr Soc. 1994;42:1035-1044.
23. Boult C, Kane RL, Louis TA, et al. Chronic conditions that lead to functional limitation in the elderly. J Gerontol. 1994;49:M28-M36.
24. Fried LP, Ettinger WH, Lind B, et al, Cardiovascular Health Study Research Group. Physical disability in older adults. J Clin Epidetniol. 1994;47:747-760.
25. Fried LP, Bandeen-Roche K. KasperJD, Guralnik JM. Association of comorbidity with disability in older women. J Clin Epidemiol. 1999;52:27-37.
26. GardnerAW, Womack C J, Sieminski D J, etal. Relationship between free-living daily physical activity and ambulatory measures in older claudicants. Angiology. 1998;49:327-337.
27. Bittner V, Weiner DH, Yusuf S, SOLVD Investigators. Prediction of mortality and morbidity with a 6-minute walk test in patients with left ventricular dysfunction. JAMA. 1993;270:1702-1707.
28. Swinburn CR, Wakefield JM, Jones PW. Performance, ventilation, and oxygen consumption in three different types of exercise tests in patients with COPD. Thorax. 1985;40:581-586.
29. Swedes PMJ. Mosterr R, Wouters EFM. Comparison of corridor and treadmill walking in patients with severe chronic obstructive pulmonary disease. Phys Ther. 1990;70:439-442.
30. Simonsick EM, Gardner AW. Poehlman ET. Assessment of physical function and exercise tolerance in older adults: mproducibility and comparabitity of five measures. Aging. 2000;12:274-280.
31. Greig C, Butler F, Skelton D, Mahmud S, Young A. Treadmill walking in old age may not reproduce the real life situation. J Am Genatr Soc. 1993;41:15-18.
32. Peeters P, Mets T. The six-minute walk as an appropriate exercise test in elderly patients with chronic heart failure. J Gerontol. 1996;51 :M147-M151.
33. Montgomery PS. Gardner AW. The clinical utility of a six-minute walk test in peripheral arterial occlusive disease patients. J Am Geriatr Soc. 1998;46:706-711.
34. Guyatt GH, Sullivan M J, Thompson PJ, et al. The six-minute walk: a new measure of exercise capacity in patients with chronic heart failure. CMAJ. 1985; 132:919-923.
35. Guralnik JM, Simonsick EM, Ferrucci L, et al. A short physical performance battery assessing lower extremity function. J Gerontol. 1994;49:M85-M94.
36. Guralnik JM, Ferrucci L. Simonsick E, Salive ME, Wallace RB. Lower extremity function in persons over 70 years as a predictor of subsequent disability. N Engl J Med. 1995;332:556-561.
37. Papapetropoulou V, Tsolakis J, Terzis S, Paschalis C, Papapetropoulos T. Neurophysiologic studies in peripheral arterial disease. J Clin Neurophysiol. 1998; 15:447-450.
38. Pasini FL. Pasterelli M, Beerman V, et al. Peripheral neuropathy associated with ischemic limb vascular disease of the lower limbs. Angiology. 1996;47:569-577.
39. Rodriguez-Sanchez C. Sanchez MM, Malik RA, Ah-See AK, Sharma AK. Morphological abnormalities in the sural nerve from patients with peripheral vascular disease. Histol Histopathol. 1991 ;6:63-71.
40. Regensteiner JG. Wolfel EE, Brass EP, et al. Chronic changes in skeletal muscle histology and function in peripheral arterial disease. Circulation. 1993;87:413-421.
41. Bendall M J, 8assey E J, Pearson MB. Factors affecting walking speed of elderly people. Age Ageing. 1989;18:327-332.
42. Zeger SL, Liang KY, Albert PS, Models for longitudinal data: a generalized estimating equation approach. Biometrics. 1988;44:1049-1060.
43. Little RJA. Modeling the drop-out mechanism in repeated-measures studies. J Am Star Assoc. 1995; 90:1112-1121.
44. Fitzmaurice GM, Laird NM, Shneyer L. An alternative parameterization of the general linear mixture model for longitudinal data with non-ignorable dropouts. Stat Med. 2001 ;20:1009-1021.
45. Hirsch AT, Criqui MH, Treat-Jacobson D, et al. The PARTNERS program: a national survey of peripheral arterial disease detection, awareness, and treatment. JAMA. 2001;286:1317-1324.
46. McDermott MM, Kerwin DR, Liu K, et al. Prevalence and significance of unrecognized lower extremity peripheral arterial disease in general medicine practice. J Gen Intern Med. 2001 ;16:384-390
47. Ouriel K, Zarins CK. Doppler ankle pressure: anastomosis evaluation of three methods of expression. Arch Surg.
48. Hiatt WR. Medical treatment of peripheral arterial disease and claudication. N Engl J Med. 2001 ;344: 1608-1621.