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BIRTHMO
Month of birth

Codes and Frequencies



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Description

BIRTHMO indicates the person's month of birth.

Comparability — Index

GENERAL
Benin
Burkina Faso
Cameroon
Egypt
El Salvador
Fiji
Greece
Guinea
Indonesia
Iran
Iraq
Jamaica
Lesotho
Malawi
Malaysia
Rwanda
Thailand
Vietnam

Comparability — General

BIRTHMO is comparable across samples apart from some universe restrictions.

In the Iran samples (2006 and 2011), month of birth is reported according to the Hijiri calendar rather than the Gregorian calendar. There are large numbers of non-responses in some samples.

Comparability — Benin [top]

In the 2013 sample, there is substantial heaping in the month of January.

Comparability — Burkina Faso [top]

In 1996 sample, large numbers of respondents are coded to "unknown" because they provided their age (in full years) rather than the date of birth. In 2006, the respondents provided their date of birth, if known.

Comparability — Cameroon [top]

In 1976, large numbers of respondents are coded to "unknown" because they provided their age at last birthday rather than the full date of birth. The 1987 sample only provides the age of the respondents. In 2005, large numbers of respondents are coded to "unknown" because they only provided their year of birth

Comparability — Egypt [top]

There are large amounts of nonresponse in the samples.

Comparability — El Salvador [top]

For the 1992 sample, there is considerable heaping in the month of June (16.73%), compared to the other birth months. This heaping is not present in the 2007 sample.

Comparability — Fiji [top]

In 1976 sample, the month of birth was grouped in two categories: born between January-September and born between September-December. That sample is not included here.

In 1986 sample, large numbers of respondents are coded to "unknown" because they provided their year of birth rather than their full date of birth.

In the 2014 sample, the data has heaping in the month of June.

Comparability — Greece [top]

The Greek samples of 1981 and 1991 only asked the question of children born within the last two calendar years.

Comparability — Guinea [top]

Roughly 95% of the cases had no response.

Comparability — Indonesia [top]

Roughly half the population in 1980 has no response.

Comparability — Iran [top]

In the samples (2006 and 2011), month of birth is reported according to the Hijiri (i.e., Persian) calendar. The Hijiri month was matched with the Gregorian month in which it began. For example, the month Bahman of the Hijiri calendar corresponds to the 30-day period that falls between January and February in the Gregorian calendar. Therefore, the month of Bahman corresponds to January in the harmonized variable. See the unharmonized source variable to recover the information in both the Hijiri and Gregorian calendars.

There are a large number of non-responses. There are an abnormally large number of responses indicating birth in Farvardin (March) or Shahrivar (August).

Comparability — Iraq [top]

There is considerable heaping of the responses in January and especially July, probably as an artifact of the instructions.

Comparability — Jamaica [top]

The variable BIRTHMO is not available for the 1982 sample. The 1991 and 2001 samples are comparable.

There are a large number of non-responses.

Comparability — Lesotho [top]

The 2006 sample has substantial heaping in June.

Comparability — Malawi [top]

For an unknown reason, responses indicating birth in the first six months (January-June) is roughly twice that of the latter six months (July-December).

Comparability — Malaysia [top]

Roughly 40% of the cases had no response.

Comparability — Rwanda [top]

The 1991 sample has many more non-responses than 2002 and 2012. In the 2012 sample, there is substantial heaping in the month of January.

Comparability — Thailand [top]

The 1980, 1990 and 2000 Thai samples report both the solar and lunar month of birth. We use programming to create 12 categories (one per month).

Comparability — Vietnam [top]

The variable BIRTHMO is comparable across samples. The only difference is that the 2009 sample has an Unknown category, while the 1989 and 1999 samples do not.

Universe

  • Argentina 2010: All persons
  • Armenia 2001: All persons
  • Armenia 2011: All persons
  • Benin 1992: All persons
  • Benin 2002: All persons
  • Benin 2013: All persons
  • Burkina Faso 1996: All persons
  • Burkina Faso 2006: All persons
  • Cameroon 1976: All persons
  • Cameroon 2005: All persons
  • China 1990: All persons
  • China 2000: All persons
  • Colombia 2005: All persons
  • Dominican Republic 2002: All persons
  • Dominican Republic 2010: All persons
  • Ecuador 2010: All persons
  • Egypt 1986: All persons
  • Egypt 1996: All persons
  • El Salvador 1992: All persons
  • El Salvador 2007: All persons
  • Fiji 1986: All persons
  • Fiji 1996: All persons
  • Fiji 2007: All persons
  • Fiji 2014: All persons
  • Greece 1981: Persons born in and after 1979
  • Greece 1991: Persons born in and after 1989
  • Greece 2011: All persons
  • Guinea 1996: All persons
  • Honduras 1988: All persons
  • Indonesia 1976: All persons
  • Indonesia 1980: All persons
  • Indonesia 1990: All persons
  • Indonesia 1995: All persons
  • Indonesia 2000: All persons
  • Indonesia 2005: All persons
  • Indonesia 2010: Persons in regular enumeration areas
  • Iran 2006: All persons
  • Iran 2011: All persons
  • Iraq 1997: All persons
  • Jamaica 1991: All persons
  • Jamaica 2001: All persons
  • Jordan 2004: All persons
  • Kyrgyz Republic 1999: All persons
  • Kyrgyz Republic 2009: All persons
  • Lesotho 2006: All persons
  • Malawi 2008: All persons
  • Malaysia 1991: All persons
  • Mali 2009: All persons
  • Mongolia 1989: All persons
  • Mongolia 2000: All persons
  • Morocco 1994: All persons
  • Morocco 2004: All persons
  • Nicaragua 1995: All persons
  • Nicaragua 2005: All persons
  • Nigeria 2010: All persons
  • Poland 2002: All persons
  • Romania 1977: All persons
  • Romania 1992: All persons
  • Romania 2002: All persons
  • Romania 2011: All persons
  • Rwanda 1991: All persons
  • Rwanda 2002: All persons
  • Rwanda 2012: All persons
  • South Africa 2011: All persons
  • Spain 1981: All persons
  • Spain 2001: All persons
  • Spain 2011: All persons
  • Thailand 1980: All persons
  • Thailand 1990: All persons
  • Thailand 2000: All persons
  • Uganda 2002: All persons
  • Uruguay 2011: All persons
  • Vietnam 1989: All persons
  • Vietnam 1999: All persons
  • Vietnam 2009: All persons

Availability

  • Argentina: 2010
  • Armenia: 2001, 2011
  • Benin: 1992, 2002, 2013
  • Burkina Faso: 1996, 2006
  • Cameroon: 1976, 2005
  • Canada: 1881, 1891, 1911
  • China: 1990, 2000
  • Colombia: 2005
  • Dominican Republic: 2002, 2010
  • Ecuador: 2010
  • Egypt: 1986, 1996
  • El Salvador: 1992, 2007
  • Fiji: 1986, 1996, 2007, 2014
  • Germany: 1819
  • Greece: 1981, 1991, 2011
  • Guinea: 1996
  • Honduras: 1988
  • Indonesia: 1976, 1980, 1990, 1995, 2000, 2005, 2010
  • Iran: 2006, 2011
  • Iraq: 1997
  • Jamaica: 1991, 2001
  • Jordan: 2004
  • Kyrgyz Republic: 1999, 2009
  • Lesotho: 2006
  • Malawi: 2008
  • Malaysia: 1991
  • Mali: 2009
  • Mongolia: 1989, 2000
  • Morocco: 1994, 2004
  • Nicaragua: 1995, 2005
  • Nigeria: 2010
  • Norway: 1910
  • Papua New Guinea: 1980, 1990, 2000
  • Poland: 2002
  • Romania: 1977, 1992, 2002, 2011
  • Rwanda: 1991, 2002, 2012
  • South Africa: 2011
  • Spain: 1981, 2001, 2011
  • Thailand: 1980, 1990, 2000
  • Uganda: 2002
  • United States: 1870, 1880a, 1880b, 1900, 1910
  • Uruguay: 2011
  • Vietnam: 1989, 1999, 2009