Paper Information

Journal:   JOURNAL OF KERMANSHAH UNIVERSITY OF MEDICAL SCIENCES (BEHBOOD)   Winter 2004 , Volume 7 , Number 4; Page(s) 36 To 42.
 
Paper: 

INTELLIGENCE QUOTIENT LEVEL OF THE CHILDREN LIVING IN HIGH LEAD AREAS IN ZANJ AN PROVINCE

 
 
Author(s):  MAHRAM M.*
 
* Zanjan University of Medical Sciences, Zanjan, Iran
 
Abstract: 

Background and Objectives: Considering the effect of heavy metals (particularly lead) on intelligent quotient level, it was measured in children living in high lead areas in Angouran district of Zanjan province.
Material and Methods: In this historical cohort study all (n=64) grade - one students living in Angouran village were selected as case group. 62 other students living in low lead areas, but with similar socio - economic, cultural and racial conditions were selected as the control group. In a double blind study using the Wechsler's intelligence scale for children - revised (WISC-R) the IQ level of both groups were calculated.
This test is regarded as the most accurate test with 80-90% reliability. The IQ of 90 or more is considered normal and less than this is low. By using chi-square the IQ of the two groups living in high and low - lead areas were compared. The T-test and P- value with 95% reliability and the relative risk of decrease of IQ due to living in high - lead areas were calculated.
Results: The average IQ level in 64 children living in high lead area was 86.64+/-9.68 with 40 (62.5%) having less than normal level. In comparison in the other group the average IQ level was 91.98+/-10.26 with 24 of the children (38.7%) having less than normal level. The IQ level in children living in high-lead area was significantly lower than children living in low-lead area (P<0.0031).
Discussion: Although the serum level of lead was not determined but the results of this study are strongly in favor of the relationship between living in high-lead areas and low IQ levels. Preventive and therapeutic precautions are necessary in theses areas.

 
Keyword(s): ZANJAN, HEAVY METALS, LEAD, IQ WECHSLER TEST
 
References: 
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