The degrees of data completeness for the response variables investigated.

Note. Complete–the variable value can be accurately determined (e.g. for 86.60% of the mothers under study, survival status (survival versus death) at age 15 of all produced offspring can be accurately determined); Incomplete–the variable value was estimated using the records available for some of all offspring (e.g. for 11.45% of the mothers, survival status data were available for some (at least one, but not all) of their offspring); Missing–there was no way to estimate the variable value and relevant mothers must be excluded from the analyses (e.g. for 1.95% of the mothers, survival status data were missing for all of their offspring); M-fertility–maternal lifetime fertility; O-survival–offspring survival rate at age 15; O-breeding–offspring breeding probability; M-LRS–maternal lifetime reproductive success; M-RBF–maternal risk of breeding failure.