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An IQ score of 115 means performance one standard deviation above the mean, while a score of 85 means performance one standard deviation below the mean, and so on. [5] This "deviation IQ" method is now used for standard scoring of all IQ tests in large part because they allow a consistent definition of IQ for both children and adults.
5.85 40–44 81 670 74 067 155 737 4.48 45–49 63 827 54 980 118 807 3.42 50–54 44 870 38 070 82 940 2.39 55–59 30 975 25 485 56 460 1.62 60–64 25 473 27 357 52 830 1.52 65-85+ 57 470 60 641 118 111 3.40 65-69 19 250 20 557 39 807 1.14 70-74 12 343 13 403 25 746 0.74 75-79 11 580 11 333 22 913 0.66 80-84 5 408 6 599 12 007 0.35 85+ 8 889
The IQ figures are based on 3 different studies for 17 nations, two studies for 30 nations, and one study for 34 nations. There were actual tests for IQ in the case of 81 countries out of the 185 countries studied. For 104 nations there were no IQ studies at all and IQ was estimated based on the average IQ of surrounding nations. [2]
IQ Range ("deviation IQ") IQ Classification 145–160 Very gifted or highly advanced 130–144 Gifted or very advanced 120–129 Superior 110–119 High average 90–109 Average 80–89 Low average 70–79 Borderline impaired or delayed 55–69 Mildly impaired or delayed 40–54 Moderately impaired or delayed
The WAIS-IV is the known current publication of the test for adults. The reason for this test was to score the individual and compare it to others of the same age group rather than to score by chronological age and mental age. The fixed average is 100 and the normal range is between 85 and 115.
The 1981 article "Average IQ values in various European countries" by Vinko Buj is the only international IQ study that over a short time period has compared IQs using the same IQ test. Rindermann (2007) states that it is of dubious quality with scant information regarding how it was done. [3] [4]
IQ tests had lower negative correlations with certain socially undesirable outcomes such as that children with high IQ were less likely to engage in juvenile crime. One example being a study finding a correlation of −0.19 (−0.17 with social class controlled for) between IQ scores and number of juvenile offenses in a large Danish sample.
The average fertility in his study was correlated at −0.031 with IQ for white women and −0.086 for black women. Vining argued that this indicated a drop in the genotypic average IQ of 1.6 points per generation for the white population, and 2.4 points per generation for the black population. [11]
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