The report, prepared by CDC’s National Center for Health Statistics, focuses not only on individual factors but also community conditions associated with long-term marriages as well as divorce and separation.

Based on interviews with nearly 11,000 women ages 15 to 44, the study also examines conditions associated with cohabitation, including the effect that premarital cohabitation has on marriage and marital stability.

“We’ve expanded our analysis beyond the basic bookends of marriage and divorce to look more closely at how the issue of cohabitation impacts the life of a relationship,” said Dr. Ed Sondik, CDC National Center for Health Statistics director.

“At the same time, we’ve also attempted to look beyond the influence of individual characteristics and are looking more at the characteristics of the community at large to get a comprehensive picture of what factors impact marriage and divorce rates in this country.”

Among the findings in the report is unmarried cohabitations overall are less stable than marriages.

The probability of a first marriage ending in separation or divorce within five years is 20 percent, but the probability of a premarital cohabitation breaking up within five years is 49 percent. After 10 years, the probability of a first marriage ending is 33 percent, compared with 62 percent for cohabitations.

The study suggests both cohabitations and marriages tend to last longer under certain conditions, such as a woman’s age at the time cohabitation or marriage began; whether she was raised throughout childhood in an intact two-parent family; whether religion plays an important role in her life; and whether she had a higher family income or lived in a community with high median family income, low male unemployment and low poverty.

The report also shows marriages that end do not always end in divorce; many end in separation and do not go through the divorce process. Separated white women are much more likely - 91 percent - to divorce after three years, compared with separated Hispanic women - 77 percent - and separated black women - 67 percent.

Meanwhile, the probability of remarriage among divorced women was 54 percent in five years - 58 percent for white women, 44 percent for Hispanic women and 32 percent for black women. However, there was also a strong probability that second marriages will end in separation or divorce: 23 percent after five years and 39 percent after 10 years.

The likelihood divorced women will remarry has been declining since the 1950s, when women who divorced had a 65 percent chance of remarrying. Data for 1995 show women who divorced in the 1980s had only a 50 percent chance of remarrying.

The report, “Cohabitation, Marriage, Divorce and Remarriage in the United States,” can be found on the CDC website at www.cdc. gov/nchs www.cdc.gov/nchs.