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Since August 2000, the "resident population" approach has been adopted in place of the "extended de facto" approach for compiling Hong Kong population figures. Revised population figures backdated to 1996 have been compiled. The population estimate compiled under the "resident population" approach is referred to as the "Hong Kong Resident Population". The "Hong Kong Resident Population" comprises "Usual Residents" and "Mobile Residents".

"Usual Residents" refer to two categories of people: (1) Hong Kong Permanent Residents who have stayed in Hong Kong for at least three months during the six months before or for at least three months during the six months after the reference time-point, regardless of whether they are in Hong Kong or not at the reference time-point; and (2) Hong Kong Non-permanent Residents who are in Hong Kong at the reference time-point.

As for "Mobile Residents", they are Hong Kong Permanent Residents who have stayed in Hong Kong for at least one month but less than three months during the six months before or for at least one month but less than three months during the six months after the reference time-point, regardless of whether they are in Hong Kong or not at the reference time-point.

Under the "resident population" approach, visitors are not included in the Hong Kong Population.

For details of the method of compiling population estimates of Hong Kong, please see the feature article entitled "Compiling Population Estimates of Hong Kong" published in the February 2002 issue of the Hong Kong Monthly Digest of Statistics.

The birth, death and natural increase figures in the Frequently Asked Statistics section are compiled using known births and known deaths. Birth rate and death rate are calculated by relating the known births and the known deaths in a year to their corresponding mid-year population.

Expectation of life at birth is the number of years of life that a person born in a given year is expected to live if he/she were subjected to the prevalent mortality conditions as reflected by the set of age-sex specific mortality rates for that year.

Total fertility rate refers to the average number of children that would be born alive to 1 000 women during their lifetime if they were to pass through their childbearing ages 15-49 experiencing the age specific fertility rates prevailing in a given year.

Child dependency ratio refers to the number of persons aged under 15 per 1 000 persons aged between 15 and 64.

Elderly dependency ratio refers to the number of persons aged 65 and over per 1 000 persons aged between 15 and 64.

Overall dependency ratio refers to the number of persons aged under 15 and those aged 65 and over per 1 000 persons aged between 15 and 64.

A registered marriage is defined as a voluntary union of life of one man and one woman to the exclusion of all others which has been contracted in accordance with the Marriage Ordinance. Re-registration of couples who had either customarily married in Hong Kong before the Marriage Reform Ordinance was enacted in October 1971 or had married outside Hong Kong, are also covered in the statistics. Marriage statistics are restricted to registered marriages only.

Median age at first marriage is an indicator of the average age of persons at their first marriage such that 50% of these persons are above this age while the other 50% are below it.

A domestic household consists of a group of persons who live together and make common provision for essentials for living. These persons need not be related. If a person makes provision for essentials for living without sharing with other persons, he/she is also regarded as a household. In this case, the household is a one-person household.