“…A number of supplementary independent variables were included, mainly as controls, in order to avoid possible confounding influences related to demographic characteristics, availability, health and attitudes (Attias-Donfut et al, 2005;Baydar and Brooks-Gunn, 1998;Guzman, 1999Guzman, , 2004Hank and Buber, 2009;Kuhltau and Mason, 1996;Presser, 1989;Silverstein and Marenco, 2001;Vandell et al, 2003). Among those were gender of the selected child (male ¼ 0, female ¼ 1), allowing for tracing lineage patterns; distance to the selected child, ranging from same household (0) to more than 500 km away (8); educational level of the selected child (from none/little ¼ 0 to higher university level ¼ 6); whether the selected child had a partner/spouse (1) or not (0), as well as the selected child's age in years above 25.…”