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Singulate mean age at marriage (SMAM): Singulate mean age at
marriage of the population is the average number of years of single person
in their whole life, if this generation has proportion of single age as the
proportion of single person collected at the survey time point.

In order to have an overall view on the age of starting a married life
of the population, when calculating the singulate mean age at marriage, the
statistical agency not only identifies married persons who are married as

stipulated by the Law on Marriage and Family but also identifies married
persons who satisfy conditions as stipulated by the Law on Marriage and
Family but have not been certificated; those who are married but do not
satisfy conditions as stipulated by the Law on Marriage and Family; those
who are child mariage; and those who cohabit with the opposite sex.

Formula:

45
15   5 5 X 50 S 50
S 


SMAM  X 15

1 S 50
Where:

SMAM: Singulate mean age at marriage.

5S X: Proportion of single age in 5-year interval of age: x -> x+5.

S 50: Proportion of single age at the age of 50 years old and S 50 is
calculated by average value of 5S 45 và 5S 50.

Number of divorce cases is the number of cases which have been
addressed for couples to get divorce by the Court of first instance under the
Law on Marriage and Family.

To ensure statistical analysis meaning, this indicator is calculated
through the divorce proportion.

Formula:

Proportion of divorce = The number of divorce cases × 1000
(‰) Average population

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