Supplementary Files
Keywords
Prediction models
Statistical correlation
Abstract
The concept of correlation entails having a couple of observations (X and Y), that is to say, the value that Y acquires for a determined value of X; the correlation makes it possible to examine the trend of two variables to be grouped together. We know that, with increasing age, blood pressure figures also increase, therefore, if we want to answer a research question like “what is the connection between age and blood pressure?” the relevant statistical test is a correlation test. This test makes it possible to quantify the magnitude of the correlation between two variables, but it is also helpful for predicting values. If these variables had a perfect correlation, the value of the variable Y could be deduced by knowing the value of X. Because of these advantages, the correlation is one of the most frequently used tests in the clinical setting since, in addition to measuring the direction and magnitude of the association of two variables, it is one of the foundations for prediction models, such as linear regression model, logistic regression model and Cox proportional hazards model.
References
Talavera JO, Rivas-Ruiz R. Investigación clínica IV. Pertinencia de la prueba estadística. Rev Med Inst Mex Seguro Soc. 2011;49(4):401-405. Disponible en: https://www.medigraphic.com/pdfs/imss/im-2012/im121k.pdf
Flores-Ruiz E, Miranda-Novales MG, Villasís-Keever MÁ. El protocolo de investigación VI: cómo elegir la prueba estadística adecuada. Estadística inferencial. Rev Alerg Mex. 2017;64(3):364-370. DOI: 10.29262/ram.v64i3.304
Portney LG, Watkins MP. Foundations of clinical research. Applications to practice. EE. UU.: F.A. Davis Company; 2015.
Sánchez-López M, Roy-García I, Velázquez-López L, Navarro-Susano LG, Soriano-Pérez AM. Baja saturación de oxígeno como factor de riesgo para desarrollar pie diabético. Aten Fam. 2019;26(2):52-57. DOI: 10.22201/facmed.14058871p.2019.2.68826
Zou KH, Tuncali K, Silverman SG. Correlation and simple linear regression. Radiology. 2003;227(3):617-622. DOI: 10.1148/radiol.2273011499
Yazici S, Korkmaz U, Erkan M, Korkmaz N, Erdem-Baki A, Alçelik A, et al. The effect of breast-feeding duration on bone mineral density in postmenopausal Turkish women: a population-based study. Arch Med Sci. 2011;7(3):486-492. DOI: 10.5114/aoms.2011.23416
Talavera JO, Rivas-Ruiz R, Pérez-Rodríguez M, Roy-García IA, Palacios-Cruz L. De vuelta a la clínica: sin justificación no existe pregunta de investigación que valga. Gac Med Mex. 2019;155(2):168-175. DOI: 10.24875/GMM.19004942
Bradford-Hill A. The environment and disease: association or causation? Proc R Soc Med. 1965;58(5):295-300.
Cicoira M, Zanolla L, Franceschini L, Rossi A, Golia G, Zamboni M, et al. Skeletal muscle mass independently predicts peak oxygen consumption and ventilatory response during exercise in noncachectic patients with chronic heart failure. J Am Coll Cardiol. 2001;37(8):2080-2085. DOI: 10.1016/s0735-1097(01)01306-7
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