Variation of goiter rate of children aged 8 to 10 from 1997 to 2011 in Chongqing

Objective: To find out the variation of total goiter rate of children aged 8 to 10 m Chongqing. Methods: The survey data of goiter examination of children aged 8 to 10 were collected from the surveillance results of iodine deficiency disorders in 1997, 1999, 2002, 2005, 2009 and 2011. Overall situation of goiter rate was analyzed as a whole. Gender, age and geographical distribution were also analyzed. Results: The highest goiter rate of children aged 8 to 10 was 23.75%(285/1200) in 1999 and the lowest was 5.52%(73/1322) in 2011 (by B ultrasound) in Chongqing, and there was a significant difference between years (χ2 = 303.59, P < 0.01), with descending trend(χ 2 trend = 14.25, P < 0.01). From 1997 to 2011, the difference of goiter rate between sexes was not statistically significant (all P < 0.05). There was no significant difference of the rate among all age groups except 2009 (χ2 = 6.31, P < 0.05) between different years (all P > 0.05). The proportion of county with goiter rate higher than 10% was 83.33%(25/30), 100.00%(30/30), 93.33%(28/30), 26.67%(8/30), 5.00%(2/40), and 6.67% (2/30), respectively, in those years. Compared between different counties, except in 1997(χ2 = 164.33, P < 0.01) and 1999 (χ2 = 51.40, P < 0.01), the difference of goiter rate in 2002 , 2005 , 2009 and 2011 was not statistically significant (all P > 0.05). Conclusion: The total goiter rate of children has a declining trend from 1997 to 2011 in Chongqing.