Women's work hours consistently increase divorce, whereas increases in men's work hours often have no statistical effect.

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Not surprisingly, the effect lost statistical significance at two years since active intervention lasted only 12 months.

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The effect is to end the production of an annual volume called the Statistical Abstract, which any librarian will tell you is one of the most dog-eared research publications.

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However, all of these, except perhaps the last, are also likely to be linked to disease and, by careful statistical analysis, Mr Eppig and his colleagues show that all of them either disappear or are reduced to a small effect when the consequences of disease are taken into account.

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