Are Australian children iodine deficient? Results of the Australian National Iodine Nutrition Study

Li, M., Eastman, C.J., Waite, K.V., Ma, G., Zacharin, M.R., Topliss, D.J., Harding, P.E., Walsh, J.P., Ward, L.C., Mortimer, R.H., Mackenzie, E.J., Byth, K. and Doyle, Z. (2006) Are Australian children iodine deficient? Results of the Australian National Iodine Nutrition Study. Medical Journal of Australia, 184 4: 165-169.

Author Li, M.
Eastman, C.J.
Waite, K.V.
Ma, G.
Zacharin, M.R.
Topliss, D.J.
Harding, P.E.
Walsh, J.P.
Ward, L.C.
Mortimer, R.H.
Mackenzie, E.J.
Byth, K.
Doyle, Z.
Title Are Australian children iodine deficient? Results of the Australian National Iodine Nutrition Study
Journal name Medical Journal of Australia   Check publisher's open access policy
ISSN 0025-729X
1326-5377
Publication date 2006-02-01
Sub-type Article (original research)
Open Access Status Not yet assessed
Volume 184
Issue 4
Start page 165
End page 169
Total pages 5
Place of publication Strawberry Hills, Australia
Publisher Australasian Medical Publishing Company
Language eng
Formatted abstract
Objective:
To document the population iodine nutritional status in Australian schoolchildren.

Design and setting:
Cross-sectional survey of schoolchildren aged 8-10 years, based on a one-stage random cluster sample drawn from all Year 4 school classes in government and non-government schools in the five mainland Australian states of New South Wales, Victoria, South Australia, Western Australia and Queensland. The study was conducted between July 2003 and December 2004.

Participants:
1709 students from 88 schools (881 boys and 828 girls), representing 85% of the estimated target number of students. The class participation rate was 65%. Main outcome measures: (i) Urinary iodine excretion (UIE) levels (compared with the criteria for the severity of iodine deficiency of the World Health Organization/International Council for the Control of Iodine Deficiency Disorders: iodine replete, UIE ≥ 100 μg/L; mild iodine deficiency, UIE 50-99 μg/L; moderate iodine deficiency, UIE 20-49 μg/L; severe iodine deficiency, UIE < 20 μg/L); (ii) Thyroid volumes measured by ultrasound (compared with new international reference values).

Results:
Overall, children in mainland Australia are borderline iodine deficient, with a national median UIE of 104 μg/L. On a state basis, NSW and Victorian children are mildly iodine deficient, with median UIE levels of 89 μg/L and 73.5 μg/L, respectively. South Australian children are borderline iodine deficient, with a median UIE of 101 μg/L. Both Queensland and Western Australian children are iodine sufficient, with median UIE levels of 136.5 μg/L and 142.5 μg/L, respectively. Thyroid volumes in Australian schoolchildren are marginally increased compared with international normative data obtained from children living in iodine sufficient countries. There was no significant association between UIE and thyroid volume.

Conclusion:
Our results confirm the existence of inadequate iodine intake in the Australian population, and we call for the urgent implementation of mandatory iodisation of all edible salt in Australia.
Keyword Thyroid volume
Urinary iodine
Reference values
Schoolchildren
Disorders
Replete
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Medicine Publications
 
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