Previously (from 1992 until 1995), the advice was that men should drink no more than 21 units per week, and women no more than 14. (The difference between the sexes was due to the typically lower weight and water-to-body-mass ratio of women.) This was changed because a government study showed that many people were in effect "saving up" their units and using them at the end of the week, a phenomenon referred to as binge drinking. "The Times" reported in October 2007 that these limits had been "plucked out of the air" and had no scientific basis.