Vitamin D deficiency in Malaysian adolescents aged 13 years: Findings from the Malaysian Health and Adolescents Longitudinal Research Team study (MyHeARTs)

Al-Sadat, N. and Majid, Hazreen Abdul and Sim, P.Y. and Tin, Tin Su and Dahlui, Maznah and Bakar, M.F.A. and Dzaki, N. and Norbaya, S. and Murray, L. and Cantwell, M.M. and Jalaludin, Muhammad Yazid (2016) Vitamin D deficiency in Malaysian adolescents aged 13 years: Findings from the Malaysian Health and Adolescents Longitudinal Research Team study (MyHeARTs). BMJ Open, 6 (8). 010689. ISSN 2044-6055, DOI

Full text not available from this repository.
Official URL:


Objective: To determine the prevalence of vitamin D deficiency (<37.5 nmol/L) among young adolescents in Malaysia and its association with demographic characteristics, anthropometric measures and physical activity. Design: This is a cross-sectional study among Form 1 (year 7) students from 15 schools selected using a stratified random sampling design. Information regarding sociodemographic characteristics, clinical data and environmental factors was collected and blood samples were taken for total vitamin D. Descriptive and multivariable logistic regression was performed on the data. Setting: National secondary schools in Peninsular Malaysia. Participants: 1361 students (mean age 12.9±0.3 years) (61.4% girls) completed the consent forms and participated in this study. Students with a chronic health condition and/or who could not understand the questionnaires due to lack of literacy were excluded. Main outcome measures: Vitamin D status was determined through measurement of sera 25- hydroxyvitamin D (25(OH)D). Body mass index (BMI) was classified according to International Obesity Task Force (IOTF) criteria. Self-reported physical activity levels were assessed using the validated Malay version of the Physical Activity Questionnaire for Older Children (PAQ-C). Results: Deficiency in vitamin D was seen in 78.9% of the participants. The deficiency was significantly higher in girls (92.6%, p<0.001), Indian adolescents (88.6%, p<0.001) and urban-living adolescents (88.8%, p<0.001). Females (OR=8.98; 95% CI 6.48 to 12.45), adolescents with wider waist circumference (OR=2.64; 95% CI 1.65 to 4.25) and in urban areas had higher risks (OR=3.57; 95% CI 2.54 to 5.02) of being vitamin D deficient. Conclusions: The study shows a high prevalence of vitamin D deficiency among young adolescents. Main risk factors are gender, ethnicity, place of residence and obesity.

Item Type: Article
Funders: University of Malaya Research Programme (RP022-14HTM), Vice Chancellor Research Grant (UMQUB3D-2011)
Uncontrolled Keywords: Adolescent; Adolescent obesity; Article; Body fat distribution; Body mass; Child; Controlled study; Cross-sectional study; Female; High risk population; High school student; Human; Indian; Major clinical study; Malay (people); Malaysian; Male; Outcome assessment; Physical activity; Physical Activity Questionnaire for Older Children; Questionnaire; Race difference; Self report; Sex difference; Urban area; Urban rural difference; Vitamin blood level; Vitamin D deficiency; Waist circumference
Subjects: R Medicine
Divisions: Faculty of Medicine
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 14 Nov 2017 07:30
Last Modified: 16 Dec 2019 08:34

Actions (login required)

View Item View Item