Abstract
Data are presented for intelligence in Sudan assessed by the Performance subtests of the WISC 111. The Sudan sample was tested in 2010 and consisted of 1460 school students aged 7 to 16years. The sample obtained a British IQ of 77.4. The British IQs declined with age shown by a statistically significant Spearman rank correlation between age and IQ of −.796 (p<.01). Data are also presented for intelligence in seven regions of Sudan but not including the region of South Sudan that became independent of Sudan in 2011. The regional data showed that the IQ was significantly lower in the most southerly region of Darfur at an IQ of 64.1 than in the six more northerly regions. There was a trend for a north–south gradient of IQ across the seven regions shown by a correlation of .51 between the regional IQs and latitude, although this is not statistically significant.
•A sample in Sudan obtained a British IQ of 77.4 on the Performance scale of the WISC 111.•The IQ was significantly lowest in the most southerly region of Darfur at IQ of 64.1.•There was a non-significant correlation of .51 between the regional IQs and latitude.