Goitre and iodine deficiency in Afghanistan: a case-control study

Area of Science:

• Public Health
• Endocrinology
• Nutritional Science

Background:

• Iodine deficiency is a leading cause of preventable mental retardation globally.
• Goitre prevalence exceeds 20% in Afghan children and women, indicating widespread iodine deficiency.
• Access to iodized salt remains limited despite a national program, with regional disparities in coverage.

Purpose of the Study:

• To determine if goitre presence is a reliable indicator of iodine deficiency.
• To investigate the relationship between goitre and thyroid function.
• To inform public health strategies for iodine deficiency disorders.

Main Methods:

• A case-control study was conducted on children and women of childbearing age.
• Participants were stratified based on the presence or absence of goitre.
• Urinary iodine levels and thyroid-stimulating hormone (TSH) levels were measured.

Main Results:

• Only 6.8% of all subjects had adequate urinary iodine levels; this was only 9% in subjects without goitre.
• Goitre was significantly associated with severe urinary iodine deficiency, but the difference was less than anticipated.
• Elevated TSH levels were observed in 14% of children without palpable goitre, indicating thyroid dysfunction.

Conclusions:

• The absence of goitre is an insufficient marker for adequate iodine status.
• Children without goitre may still have elevated TSH levels, suggesting underlying iodine deficiency.
• Short-term iodine supplementation should be considered universally until iodized salt access is widespread.