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Ann Thorac Surg 1999;68(4):1321-5. 31. O'Connor GT, Malenka DJ, Quinton H, Robb JF, Kellett MA, Jr., Shubrooks S, Bradley WA, Hearne MJ, Watkins MW, Wennberg DE, Hettleman B, O'Rourke DJ, McGrath PD, Ryan T, Jr., VerLee P. Multivariate prediction of in-hospital mortality after percutaneous coronary interventions in 1994-1996. Northern New England Cardiovascular Disease Study Group. J Am Coll Cardiol 1999;34(3):681-91. 32. Wennberg DE, Malenka DJ, Sengupta A, Lucas FL, Vaitkus PT, Quinton H, O'Rourke D, Robb JF, Kellett MA, Jr., Shubrooks SJ, Jr., Bradley WA, Hearne MJ, Lee PV, O'Connor GT. Percutaneous transluminal coronary angioplasty in the elderly: epidemiology, clinical risk factors, and in-hospital outcomes. The Northern New England Cardiovascular Disease Study Group [see comments]. Amer Heart J 1999;137(4 Pt 1):639-45. 33. Birkmeyer NJ, Marrin CA, Morton JR, Leavitt BJ, Lahey SJ, Charlesworth DC, Hernandez F, Olmstead EM, O'Connor GT. Decreasing mortality for aortic and mitral valve surgery in Northern New England. Northern New England Cardiovascular Disease Study Group. Ann Thorac Surg 2000;70(2):432-7. 34. Braxton JH, Marrin CA, McGrath PD, Ross CS, Morton JR, Norotsky M, Charlesworth DC, Lahey SJ, Clough RA, O'Connor GT. Mediastinitis and long-term survival after coronary artery bypass graft surgery. Northern New England Cardiovascular Disease Study Group. Ann Thorac Surg 2000;70(6):2004-7. 35. Dacey LJ, Munoz JJ, Johnson ER, Leavitt BJ, Maloney CT, Morton JR, Olmstead EM, Birkmeyer JD, O'Connor GT. Effect of preoperative aspirin use on mortality in coronary artery bypass grafting patients. Northern New England Cardiovascular Disease Study Group. Ann Thorac Surg 2000;70(6):1986-90. 36. Dacey LJ, Munoz JJ, Johnson ER, Leavitt BJ, Maloney CT, Morton JR, Olmstead EM, Birkmeyer JD, O'Connor GT. Effect of preoperative aspirin use on mortality in coronary artery bypass grafting patients. Northern New England Cardiovascular Disease Study Group. Ann Thorac Surg 2000;70(6):1986-90. 37. Shubrooks SJ, Malenka DJ, Piper WD, Bradley WA, Watkins MW, Ryan TJ, Hettleman BD, VerLee PN, O'Meara JR, Robb JF, Kellett MA, Hearne MA, McGrath PD, Wennberg DE, O'Rourke DJ, Silver TM. Safety and efficacy of percutaneous coronary interventions performed immediately after diagnostic catheterization in northern New England and comparison with similar procedures performed later. Am J Cardiol 2000;86(1):41-5. 38. DeFoe GR, Ross CS, Olmstead EM, Surgenor SD, Fillinger MP, Groom RC, Forest RJ, Pieroni JW, Warren CS, Bogosian ME, Krumholz CF, Clark C, Clough RA, Weldner PW, Lahey SJ, Leavitt BJ, Marrin CA, Charlesworth DC, Marshall P, O'Connor GT. Lowest hematocrit on bypass and adverse outcomes associated with coronary artery bypass grafting. Ann Thorac Surg 2001;71(3):769-76. 39. Hernandez F, Cohn WE, Baribeau YR, Tryzelaar JF, Charlesworth DC, Clough RA, Klemperer JD, Morton JR, Westbrook BM, Olmstead EM, O'Connor GT. In-hospital outcomes of off-pump versus on-pump coronary artery bypass procedures: a multicenter experience. Ann Thorac Surg 2001;72(5):1528-33; discussion 33-4. 40. Leavitt BJ, O'Connor GT, Olmstead EM, Morton JR, Maloney CT, Dacey LJ, Hernandez F, Lahey SJ. Use of the internal mammary artery graft and in-hospital mortality and other adverse outcomes associated with coronary artery bypass surgery. Circulation 2001;103(4):507-12. 41. Niles NW, McGrath PD, Malenka D, Quinton H, Wennberg D, Shubrooks SJ, Tryzelaar JF, Clough R, Hearne MJ, Hernandez F, Jr., Watkins MW, O'Connor GT. Survival of patients with diabetes and multivessel coronary artery disease after surgical or percutaneous coronary revascularization: results of a large regional prospective study. J Am Coll Cardiol 2001;37(4):1008-15. 42. 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