Volume 57, Issue 4 pp. 819-826
ORIGINAL ARTICLE

Prevalence and risk factors associated with low bone mineral density in Asian adolescents with anorexia nervosa and atypical anorexia nervosa

Courtney Davis MD

Corresponding Author

Courtney Davis MD

Adolescent Medicine Service, KK Women's and Children's Hospital, Singapore, Singapore

SingHealth Duke-NUS Paediatric Academic Clinical Programme, Singapore, Singapore

Correspondence

Courtney Davis, Adolescent Medicine Service, KK Women's and Children's Hospital, 100 Bukit Timah Road, Singapore 229899, Singapore.

Email: [email protected]

Contribution: Conceptualization, Formal analysis, ​Investigation, Methodology, Supervision, Writing - original draft, Writing - review & editing

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Hannah Marian Mei En Lie MBBS

Hannah Marian Mei En Lie MBBS

Lee Kong Chian School of Medicine, Novena Campus, Clinical Sciences Building, Singapore, Singapore

Contribution: Conceptualization, Data curation, Formal analysis, Methodology, Writing - original draft

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Rashida Farhad Vasanwala MD

Rashida Farhad Vasanwala MD

SingHealth Duke-NUS Paediatric Academic Clinical Programme, Singapore, Singapore

Endocrinology Service, KK Women's and Children's Hospital, Singapore, Singapore

Contribution: Conceptualization, Writing - review & editing

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Juliet Sher Kit Tan MD

Juliet Sher Kit Tan MD

Adolescent Medicine Service, KK Women's and Children's Hospital, Singapore, Singapore

SingHealth Duke-NUS Paediatric Academic Clinical Programme, Singapore, Singapore

Contribution: Writing - review & editing

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Jean Yin Oh MB, BCh, BAO

Jean Yin Oh MB, BCh, BAO

Adolescent Medicine Service, KK Women's and Children's Hospital, Singapore, Singapore

SingHealth Duke-NUS Paediatric Academic Clinical Programme, Singapore, Singapore

Contribution: Writing - review & editing

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Kumudhini Rajasegaran MB, Bch, BAO

Kumudhini Rajasegaran MB, Bch, BAO

Adolescent Medicine Service, KK Women's and Children's Hospital, Singapore, Singapore

SingHealth Duke-NUS Paediatric Academic Clinical Programme, Singapore, Singapore

Contribution: Writing - review & editing

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Chu Shan Elaine Chew MBBS

Chu Shan Elaine Chew MBBS

Adolescent Medicine Service, KK Women's and Children's Hospital, Singapore, Singapore

SingHealth Duke-NUS Paediatric Academic Clinical Programme, Singapore, Singapore

Contribution: Conceptualization, Formal analysis, Methodology, Writing - review & editing

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First published: 31 October 2023
Citations: 1
Action Editor: B. Timothy Walsh

Courtney Davis and Hannah Marian Mei En Lie share the first authorship.

Abstract

Objective

This retrospective study aimed to evaluate the prevalence and risk factors for low bone mineral density (BMD) at diagnosis in Asian adolescent females with anorexia nervosa (AN) and atypical AN.

Method

We analyzed the BMD results for 213 patients between 10 and 18 years of age, with AN and atypical AN receiving care at a pediatric hospital in Singapore. We used linear regression analyses to determine if type of eating disorder, premorbid weight, and duration of amenorrhea were risk factors for low BMD. For a subset of patients with repeat BMD evaluation, we used paired t-tests to assess the impact of weight or menstrual restoration on the change in BMD.

Results

The prevalence of BMD height-for-age Z-scores <−2 at presentation was higher in patients with AN (13.0%) than atypical AN (2.3%) (p = .034). In multivariate regression, a diagnosis of atypical AN was protective against low BMD at the lumbar spine (B = 0.394, p = .009) and total body less head (B = 0.774, p = .010). Duration of amenorrhea was not associated with BMD across all sites. For those with repeat BMD measures, there was significantly less deterioration in the BMD Z-scores for patients with weight or menstrual restoration (R = −0.22 ± 0.59, NR = −0.69 ± 0.43, p = .029).

Conclusions

Duration of amenorrhea was not associated with BMD in this sample. A diagnosis of AN was correlated with lower BMD than atypical AN. Further research is needed to better understand the relationship between amenorrhea, weight status, and bone health in Asian adolescents with eating disorders.

Public Significance

In this sample, 13% of Asian adolescents with AN and 2.3% of Asian adolescents with atypical AN have low BMD. In our study population, duration of amenorrhea was not correlated with BMD. Among adolescents with AN, a history of being underweight at the highest pre-morbid BMI, is correlated with low BMD. It is important for physicians to take a thorough weight history in evaluating bone health in this population.

CONFLICT OF INTEREST STATEMENT

All authors have no potential sources of conflict of interest.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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