Association between living environment domain and child IQ status. Note: Higher scores indicate more favorable conditions. The figure represent the association between environmental domains ( physical safety , mental stress and public services) with child’s IQ level. The three bars represent the domains mean score in low and high IQ level groups. The values inside the bars represent mean ± standard deviation. Independent t test was performed to assess the association between the three domains and IQ and it appeared to be significant with p value of < 0.01 respectively. The higher the score of the three domains the better the IQ, in mental stress domain the higher score represent less stress, same things for the other two domains.