Development and validation of a diabetes mellitus and prediabetes risk prediction function for case finding in primary care in Hong Kong: a cross-sectional study and a prospective study protocol paper

Weinan Dong, Will Ho Gi Cheng, Emily Tsui Yee Tse, Yuqi Mi, Carlos King Ho Wong, Eric Ho Man Tang, Esther Yee Tak Yu, Weng Yee Chin, Laura Elizabeth Bedford, Welchie Wai Kit Ko, David Vai Kiong Chao, Kathryn Choon Beng Tan, Cindy Lo Kuen Lam, Weinan Dong, Will Ho Gi Cheng, Emily Tsui Yee Tse, Yuqi Mi, Carlos King Ho Wong, Eric Ho Man Tang, Esther Yee Tak Yu, Weng Yee Chin, Laura Elizabeth Bedford, Welchie Wai Kit Ko, David Vai Kiong Chao, Kathryn Choon Beng Tan, Cindy Lo Kuen Lam

Abstract

Introduction: Diabetes mellitus (DM) is a major non-communicable disease with an increasing prevalence. Undiagnosed DM is not uncommon and can lead to severe complications and mortality. Identifying high-risk individuals at an earlier disease stage, that is, pre-diabetes (pre-DM), is crucial in delaying progression. Existing risk models mainly rely on non-modifiable factors to predict only the DM risk, and few apply to Chinese people. This study aims to develop and validate a risk prediction function that incorporates modifiable lifestyle factors to detect DM and pre-DM in Chinese adults in primary care.

Methods and analysis: A cross-sectional study to develop DM/Pre-DM risk prediction functions using data from the Hong Kong's Population Health Survey (PHS) 2014/2015 and a 12-month prospective study to validate the functions in case finding of individuals with DM/pre-DM. Data of 1857 Chinese adults without self-reported DM/Pre-DM will be extracted from the PHS 2014/2015 to develop DM/Pre-DM risk models using logistic regression and machine learning methods. 1014 Chinese adults without a known history of DM/Pre-DM will be recruited from public and private primary care clinics in Hong Kong. They will complete a questionnaire on relevant risk factors and blood tests on Oral Glucose Tolerance Test (OGTT) and haemoglobin A1C (HbA1c) on recruitment and, if the first blood test is negative, at 12 months. A positive case is DM/pre-DM defined by OGTT or HbA1c in any blood test. Area under receiver operating characteristic curve, sensitivity, specificity, positive predictive value and negative predictive value of the models in detecting DM/pre-DM will be calculated.

Ethics and dissemination: Ethics approval has been received from The University of Hong Kong/Hong Kong Hospital Authority Hong Kong West Cluster (UW19-831) and Hong Kong Hospital Authority Kowloon Central/Kowloon East Cluster (REC(KC/KE)-21-0042/ER-3). The study results will be submitted for publication in a peer-reviewed journal.

Trial registration number: US ClinicalTrial.gov: NCT04881383; HKU clinical trials registry: HKUCTR-2808; Pre-results.

Keywords: DIABETES & ENDOCRINOLOGY; PRIMARY CARE; STATISTICS & RESEARCH METHODS.

Conflict of interest statement

Competing interests: None declared.

© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

Figures

Figure 1
Figure 1
Study flow diagram. CBC, complete blood count; DM, diabetes mellitus; FU, follow-up; HbA1c, haemoglobin A1C; OGTT, Oral Glucose Tolerance Test; Pre-DM, pre-diabetes mellitus.

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