An astonishing recent discovery is that men have a 4- to 5-point IQ advantage over women by adulthood. This was confirmed by a study conducted on 100,000 17- to 18-year-//olds on the Scholastic Assessment Test (SAT).

During the school years, the sex difference is not obvious because girls mature faster than boys. This is the reason why sex difference was not detected for years.

145 items from the SAT were examined by a study published in the September 2006 issue of the journal Intelligence. It revealed that there was a male IQ advantage of 3.63 points.

It also found that the g factor--the general factor of mental ability underlay both the SAT Verbal (SAT-V) and the SAT Mathematics (SAT-M) scales with the congruence between these components greater than 0.90, and that it was the g factor that predicted student grades better than the traditionally used SAT-V and SAT-M scales.

The male and the female g factors were congruent in excess of .99, and they favored males to an equivalent of 3.63 IQ points.

The male-female differences were present at every socioeconomic level, and across several ethnic groups. The average male advantage was found "throughout the entire distribution of scores, in every level of family income, for every level of fathers' and of mothers' education, and for each and every one of seven ethnic groups," said J. Philippe Rushton, professor of psychology at the University of Western Ontario, one of the authors of the study.

The paper's results dovetail with those from several other recently published studies showing that men--surprisingly--have a 4- to 5- IQ point advantage over women by late adolescence and early adulthood. Before that age the two sexes are equal in general intelligence.

As such, the findings overturn a 100-year consensus that men and women average the same in general mental ability.

Because girls mature faster than boys, the sex difference is masked du
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