Argentina, respectively. In a book review for the Journal of Economic Literature, economist Thomas Nechyba wrote: "Such sweeping conclusions based on relatively weak statistical evidence and dubious presumptions seem misguided at best and quite dangerous if taken seriously. It is therefore difficult to find much to recommend in this book." Lynn's 2006 Race Differences in Intelligence is the largest review of the global cognitive ability data. The book organises the data by ten population groups and (in the 2015 edition) covers over 500 published articles. Lynn's meta-analysis lists the average IQ scores of East Asians (105), Europeans (99), the Inuit (91), Southeast Asians and indigenous peoples of the Americas each (87), Pacific Islanders (85), Middle Easterners, South Asians and North Africans each (84), East and West Africans (67), Australian Aborigines (62) and Bushmen and Pygmies (54). Lynn has previously argued that nutrition is the best-supported environmental explanation for variation in the lower range, and a number of other environmental explanations have been advanced. In his 2011 book The Chosen People, Lynn offers largely genetic explanations for Ashkenazi Jewish intelligence (generally estimated at 107–115 IQ). Sex differences in intelligence, 2004 Lynn's research correlating brain size and reaction time with measured intelligence led him to the problem that men and women have different-sized brains in proportion to their bodies. In 2004, Lynn and Irwing conducted a meta-analysis and reported that an IQ difference of roughly 5 points does appear from age 15 and onward on the progressive matrices. However, in 2006, researchers such as Johannes Rojahn and Alan S. Kaufman found contradictory results in gender IQ differences. Rojahn's study found that the discrepancies between the gender development were smaller than predicted by Lynn and in fact were so small that they have little or no practical importance. Intranational intelligence variations, 2005 In a 2005 article, Lynn reported that Mexicans of European descent had an IQ of 98, Mestizos in Mexico had an IQ of 94, and indigenous peoples of Mexico had an IQ of 83, explaining the lower-than-expected IQ of Indians on their poor nutrition and other social factors. In a 2010 article about IQ in Italy, Lynn contended that IQs are highest in the north (103 in Friuli-Venezia Giulia) and lowest in the south (89 in Sicily) and are correlated with average incomes, stature, infant mortality, literacy and education. The lack of any actual IQ test data (as Lynn used PISA