Heaton summarizes various LDS marriage statistics.
Tim Heaton, "Vital Statistics," in Latter-Day Saint Social Life: Social Research on the LDS Church and Its Members, ed. James T. Duke (Provo, UT: BYU Religious Studies Center, 1998), accessed November 23, 2021
The distribution of households does not fit any uniform pattern across countries. The idealized vision of a family with a husband and wife married in the temple and children present describes only one out of five LDS families in the United States and less than 3 percent of LDS families in Japan. Information for these four countries suggests that the household composition of the LDS membership is diverse.