Study by non-LDS demographer shows low LDS divorce rates.
Evelyn L. Lehrer and Carmel U. Chiswick, "Religion as a Determinant of Marital Stability," Demography 30, no. 3 (1993): 395
With fifth-year dissolution probabilities of 0.13 and 0.36 respectively, homogamous Mormon marriages are the most stable and those among two persons reporting "no religion" the least stable. The remarkable stability of Mormon marriages is consistent with the fact that this is a small group whose religious beliefs and practices differ substantially from the majority culture, and for which the role of the family is central.