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Journal of Medical Internet Research


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Published on 05.03.18 in Vol 20, No 3 (2018): March

Preprints (earlier versions) of this paper are available at, first published Feb 11, 2018.

This paper is in the following e-collection/theme issue:

    Letter to the Editor

    Comment on: Clinical Validity, Understandability, and Actionability of Online Cardiovascular Disease Risk Calculators: Systematic Review

    School of Medicine, College of Health Sciences, Universidad San Francisco de Quito, Quito, Ecuador

    Corresponding Author:

    Ivan Sisa, MD, MPH, MS

    School of Medicine

    College of Health Sciences

    Universidad San Francisco de Quito

    Diego de Robles y Via Interoceanica



    Phone: 593 2 297 1700 ext 4017


    I am writing regarding the systematic review about clinical validity, understandability, and actionability of online cardiovascular disease (CVD) risk calculators recently published by Dr Bonner and colleagues [1].

    Although Dr Bonner and colleagues used a comprehensive two-step research strategy to identify Web addresses that contained a CVD risk calculator, which led to the identification of 67 Web pages, a very important CVD risk model, the Systematic COronary Risk Evaluation (SCORE) risk assessment model [2], was ignored. Developed by the European Society of Cardiology, this model was derived from 12 European cohort studies (250,000 patients data collected and 3 million person-years of observation) and is based on classical risk factors such as gender, age, total cholesterol, systolic blood pressure, and smoking status. The SCORE risk assessment model should have been included because it satisfies Dr Bonner’s inclusion criteria as it predicts the risk of developing a CVD event and an electronic interactive version of this model is freely available on the European Society of Cardiology's Web page [3].

    Furthermore, there are other risk assessment models locally developed in countries such as China, India, and Korea that are not taken into account in this study. Thus, it would have been useful if the authors had added to their research strategy a literature search of review documents focusing on cardiovascular risk assessment as was carried out by Zhao and colleagues [4].

    Editorial note: Authors were invited to respond but declined. They agree that additional calculators exist that could have been included if a different method was used.


    1. Bonner C, Fajardo MA, Hui S, Stubbs R, Trevena L. Clinical Validity, Understandability, and Actionability of Online Cardiovascular Disease Risk Calculators: Systematic Review. J Med Internet Res 2018 Feb 01;20(2):e29 [FREE Full text] [CrossRef] [Medline]
    2. Conroy RM, Pyörälä K, Fitzgerald AP, Sans S, Menotti A, De BG, SCORE project group. Estimation of ten-year risk of fatal cardiovascular disease in Europe: the SCORE project. Eur Heart J 2003 Jun;24(11):987-1003. [Medline]
    3. European Society of Cardiology. SCORE risk charts: the European cardiovascular disease risk assessment model   URL: [accessed 2018-02-10]
    4. Zhao D, Liu J, Xie W, Qi Y. Cardiovascular risk assessment: A global perspective. Nat Rev Cardiol 2015;12:301-311. [CrossRef]


    CVD: cardiovascular disease
    SCORE: Systematic COronary Risk Evaluation

    Edited by G Eysenbach; This is a non-peer-reviewed article. submitted 11.02.18; accepted 14.02.18; published 05.03.18

    ©Ivan Sisa. Originally published in the Journal of Medical Internet Research (, 05.03.2018.

    This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on, as well as this copyright and license information must be included.