Di Angelantonio, Emanuele2; Gao, Pei2; Khan, Hassan2; Butterworth, Adam S2; Wormser, David2; Kaptoge, Stephen2; Kondapally Seshasai, Sreenivasa Rao2; Thompson, Alex2; Sarwar, Nadeem2; Willeit, Peter2; Ridker, Paul M2; Barr, Elizabeth L M2; Khaw, Kay-Tee2; Psaty, Bruce M2; Brenner, Hermann2; Balkau, Beverley2; Dekker, Jacqueline M2; Lawlor, Debbie A2; Daimon, Makoto2; Willeit, Johann2; Njølstad, Inger2; Nissinen, Aulikki2; Brunner, Eric J2; Kuller, Lewis H2; Price, Jackie F2; Sundström, Johan2; Knuiman, Matthew W2; Feskens, Edith J M2; Verschuren, W M M2; Wald, Nicholas2; Bakker, Stephan J L2; Whincup, Peter H2; Ford, Ian2; Goldbourt, Uri2; Gómez-de-la-Cámara, Agustín2; Gallacher, John2; Simons, Leon A2; Rosengren, Annika2; Sutherland, Susan E2; Björkelund, Cecilia2; Blazer, Dan G2; Wassertheil-Smoller, Sylvia2; Onat, Altan2; Marín Ibañez, Alejandro2; Casiglia, Edoardo2; Jukema, J Wouter2; Simpson, Lara M2; Giampaoli, Simona2; Nordestgaard, Børge G3; Selmer, Randi2; Wennberg, Patrik2; Kauhanen, Jussi2; Salonen, Jukka T2; Dankner, Rachel2; Barrett-Connor, Elizabeth2; Kavousi, Maryam2; Gudnason, Vilmundur2; Evans, Denis2; Wallace, Robert B2; Cushman, Mary2; D'Agostino, Ralph B2; Umans, Jason G2; Kiyohara, Yutaka2; Nakagawa, Hidaeki2; Sato, Shinichi2; Gillum, Richard F2; Folsom, Aaron R2; van der Schouw, Yvonne T2; Moons, Karel G2; Griffin, Simon J2; Sattar, Naveed2; Wareham, Nicholas J2; Selvin, Elizabeth2; Thompson, Simon G2; Danesh, John2
1 Department of Clinical Medicine, Department of Clinical Medicine, Faculty of Health and Medical Sciences, Københavns Universitet2 unknown3 Department of Clinical Medicine, Department of Clinical Medicine, Faculty of Health and Medical Sciences, Københavns Universitet
IMPORTANCE: The value of measuring levels of glycated hemoglobin (HbA1c) for the prediction of first cardiovascular events is uncertain. OBJECTIVE: To determine whether adding information on HbA1c values to conventional cardiovascular risk factors is associated with improvement in prediction of cardiovascular disease (CVD) risk. DESIGN, SETTING, AND PARTICIPANTS: Analysis of individual-participant data available from 73 prospective studies involving 294,998 participants without a known history of diabetes mellitus or CVD at the baseline assessment. MAIN OUTCOMES AND MEASURES: Measures of risk discrimination for CVD outcomes (eg, C-index) and reclassification (eg, net reclassification improvement) of participants across predicted 10-year risk categories of low (<5%), intermediate (5% to <7.5%), and high (≥ 7.5%) risk. RESULTS: During a median follow-up of 9.9 (interquartile range, 7.6-13.2) years, 20,840 incident fatal and nonfatal CVD outcomes (13,237 coronary heart disease and 7603 stroke outcomes) were recorded. In analyses adjusted for several conventional cardiovascular risk factors, there was an approximately J-shaped association between HbA1c values and CVD risk. The association between HbA1c values and CVD risk changed only slightly after adjustment for total cholesterol and triglyceride concentrations or estimated glomerular filtration rate, but this association attenuated somewhat after adjustment for concentrations of high-density lipoprotein cholesterol and C-reactive protein. The C-index for a CVD risk prediction model containing conventional cardiovascular risk factors alone was 0.7434 (95% CI, 0.7350 to 0.7517). The addition of information on HbA1c was associated with a C-index change of 0.0018 (0.0003 to 0.0033) and a net reclassification improvement of 0.42 (-0.63 to 1.48) for the categories of predicted 10-year CVD risk. The improvement provided by HbA1c assessment in prediction of CVD risk was equal to or better than estimated improvements for measurement of fasting, random, or postload plasma glucose levels. CONCLUSIONS AND RELEVANCE: In a study of individuals without known CVD or diabetes, additional assessment of HbA1c values in the context of CVD risk assessment provided little incremental benefit for prediction of CVD risk.
J a M A: the Journal of the American Medical Association, 2014, Vol 311, Issue 12, p. 1225-1233
Aged; C-Reactive Protein; Cholesterol, HDL; Coronary Disease; Diabetes Mellitus; Female; Hemoglobin A, Glycosylated; Humans; Male; Middle Aged; Predictive Value of Tests; Prospective Studies; Risk Assessment; Stroke