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[A study on the variation of goiter rates, urinary iodine and household salt iodine intake among children in West China].

OBJECTIVE
To study the factors leading to the variation of children's total goiter rates, urine iodine and salt iodine in West China.


METHODS
Design effect (DEFF) was used to evaluate the variation of indicators.


RESULTS
DEFF of children's total goiter rate was about 3.0 in 9 provinces, and the proportion was 75.0%. The DEFF of urine iodine was 1.0 - 3.5 in 6 provinces, and the proportion was 50.0%. The DEFF of intake rate of qualified iodized salt was over 3.0 in 11 provinces. The DEFF of covering rate of iodized salt was about 3.0 in 4 provinces.


CONCLUSION
In order to provide scientific basis for IDD surveillance in China, other than bias due to methods of no-sampling, sample size should be further calculated in West China. Thus the main influencing factors of indicator variation could be measured with scientific and reasonable basis.