As you can see in table 4.3 in Pakistan DHS 2012-13 (Age at first marriage) that there is a column percentage never married. The survey in Pakistan 2012-13 DHS includes only ever-married women. So where this information come from? The answer Is that an adjustment is made, to include the missing never-married women, called all women factor. The explanation and the use of the all women factors is explained in the DHS Guide to Statistics (starting on page 18). This guide and other documents can be found on our website: http://www.dhsprogram.com The Guide to DHS Statistics: http:// www.dhsprogram.com/publications/publication-dhsg1-dhs-questi onnaires-and-manuals.cfm