A new study has revealed a clear correlation between intelligence and childlessness - with cleverer women more likely to choose not to have a family

The study, which was conducted by Satoshi Kanazawa, a researcher at the London School of Economics, found that a woman's urge to have children decreases by a quarter for every 15 extra IQ points. When Kanazawa, who used data from Britain's National Child Development Study, added controls for economics and education, the results remained the same - the more intelligent the woman, the less likely she was to have children. Figures released by the Office of National Statistics in Britain reveal that the proportion of women without children has almost doubled since the 1990's. One in five 45-year-olds is childless, while among those with degrees, the figure rises to 43%, suggesting that Kanazawa's findings are sound.