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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.

5SX: Proportion of single age in 5-year interval of age: x -> x+5.
S50: Proportion of single age at the age of 50 years old and S50 is
calculated by average value of 5S45 và 5S50.
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

Average age of divorce
The population’s average age of divorce is the arithmetic mean age of
all individuals whose divorce events occurred during the reporting period.

Formula:
Average age = Total age of divorced persons
of divorce Total number of divorced persons

The rate of under-5 children registered with birth certificate

Under-5 children registered with birth certificate are the number of
children under 5 years old counted at their date of birth certificated and
granted with birth certificate in accordance with the Law on Civil Status.

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