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[Analysis on variation of urinary iodine of children by spatial autoregressive model]
Biyun Xu1, Bingwei Chen, Zongzan Ni
1School of Public Health, Sichuan University, Chengdu 610041, China.
Objective:
To study spatial autocorrelation and spatial variation of urinary iodine of children and to provide references for statistical data analysis of spatial disease.
Methods:
Taking urinary iodine as response variable, salt iodine and altitude as independent variable, linear regression and spatial autoregressive models were made.
Results:
69.8%, 32.8%, 43.9% variations of children urinary iodine were caused by salt iodine, altitude and spatial autocorrelation in 1995, 1997 and 1999, took altitude away, 57.6%, 21.4%, 18.8% of variations of urinary iodine were caused by other spatial factors. Positive correlation was showed between the level of urinary iodine and salt iodine, negative correlation was showed between urinary iodine and altitude.
Conclusion:
There was higher clustering in the geographical location among urinary iodine of children, the level of urinary iodine had been decreased since 1995. This implied that status of nutrition had been improved and one of most effective way to control iodine deficiency disorders was through universal salt iodization.
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