Variable	Definition
International migrant stock at mid-year by age and sex	Estimates of the international migrant stock by age and sex and by major area, region, country or area.
Total population at mid-year by age and sex (thousands)	Estimates of the total population obtained from World Population Prospects: The 2008 Revision. The estimates refer to 1 July.
International migrant stock as percentage of the total population by age and sex	Estimated number of international migrants divided by the total population, expressed as a percentage.
Percentage distribution of the international migrant stock by age and sex	Estimated number of international migrants for each age group divided by the total number of international migrants, expressed as a percentage.
Female migrants as a percentage of all international migrants	Percentage of female migrants among all international migrants.