21. jan 1991 Region. Months. 89. 3.2.12. Women (bom 1945-1968) having given live birth, by cohabitational status at first birth. Figures for groups of first child's year of birth. Per cent more up-to-date, and to some extent new, know- ledge about the use . deviation of the difference M1-M2 is Vst +Sr. W2.02+2.22=3.0.. Senior ntr birthday date