Family nuclei by average size (in thousands).

The count and description of the families of the Basque Country is done using various statistical sources. On the one hand, families are counted through the Population and Housing Census; on the other hand, the operation Demographic Survey (ED), of an intercensal and five-year periodicity, offers information on the formation of families, family size, preferences on the number and spacing of children, as well as numerous other characteristics, using the method of retrospective approximation to demographic phenomena. The count and description of the families of the Basque Country is done using various statistical sources. On the one hand, families are counted through the Population and Housing Census; on the other hand, the operation Demographic Survey (ED), of an intercensal and five-year periodicity, offers information on the formation of families, family size, preferences on the number and spacing of children, as well as numerous other characteristics, using the method of retrospective approximation to demographic phenomena.巴斯克地区家庭数量与家庭特征的统计与描述依托多类统计数据源开展。一方面，家庭数量通过人口与住房普查（Population and Housing Census）统计得出；另一方面，每五年开展一次的普查间人口统计调查（Demographic Survey，简称ED）采用人口现象回溯近似法，可提供家庭组建情况、家庭规模、子女数量与生育间隔偏好，以及其他多项家庭相关特征信息。