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DOBCMC
Woman's birthdate in century month
Return to Core demographics variables list

DOBCMC is a 4-digit variable that represents the century-month value (months since 1900) of the woman's birthdate. The following values represent NIU (not in universe) or missing cases:

9995 = Not interviewed (female questionnaire)
9996 = Not interviewed (household questionnaire)
9998 = No response or missing
9999 = NIU (not in universe)

Description

DOBCMC reports the century month code (CMC) for the month and year of the woman's birthdate.

Note that January is consistently the most common month across samples (see BIRTHMO). Due to the data entry format of the survey, if a respondent reported a year but not a month for her birthdate, January was the default month. Also due to the data entry format, if a woman skipped the question, the default date was January 1st, 2021. IPUMS has recoded these latter cases to "No response."

Century month codes (CMC) are particularly useful for checking the consistency of dates, calculating intervals between events, and imputing dates when the information for an event is missing or partially complete.

Century month codes (CMC) are calculated by multiplying by 12 the difference between the year of an event and 1900. The year 1900 was chosen as the reference period because all of the relevant events for PMA2020 occurred during the twentieth or twenty-first centuries. The month of the event is added to the previous result, in the following formula:

CMC = (Year - 1900) * 12 + Month
For example, the CMC for June 2002 is:

CMC = (2002 - 1900) * 12 + 6 = 1230

In other words, 1,230 months have elapsed between January 1900 and June 2002. Starting with CMC figures, one can calculate the month and year using the following formulas:

Year = int( ( CMC - 1 )/12 ) + 1900

[int(x) is the integer part of x]

Month = CMC - ( ( Year - 1900 ) * 12 )

The information above is based on "Online Guide to DHS Statistics" (Rutstein and Rojas, 2006).

The question associated with this variable was included in the female questionnaire.

Comparability

There are universe differences among a small number of samples; see the Universe tab for more details.

Universe

  • Burkina Faso 2014 Round 1 Female and Household: Women aged 15-49.
  • Burkina Faso 2015 Round 2 Female and Household: Women aged 15-49.
  • Burkina Faso 2016 Round 3 Female and Household: Women aged 15-49.
  • Burkina Faso 2016 Round 4 Female and Household: Women aged 15-49.
  • Burkina Faso 2017 Round 5 Female and Household: Women aged 15-49.
  • Burkina Faso 2018 Round 6 Female and Household: Women aged 15-49.
  • Burkina Faso 2020 Female and Household: Women aged 15-49.
  • Burkina Faso 2021 Female and Household: Women aged 15-49.
  • Burkina Faso 2022 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2014 Round 2 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2015 Round 3 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2015 Round 4 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2015 Round 4 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2016 Round 5 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2016 Round 5 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2017 Round 6 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2017 Round 6 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2018 Round 7 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2018 Round 7 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2019 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2019 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2020 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2020 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kinshasa) 2021 Female and Household: Women aged 15-49.
  • Congo Democratic Republic (Kongo Central) 2021 Female and Household: Women aged 15-49.
  • Cote D'Ivoire 2017 Round 1 Female and Household: Women aged 15-49.
  • Cote D'Ivoire 2018 Round 2 Female and Household: Women aged 15-49.
  • Cote D'Ivoire 2020 Female and Household: Women aged 15-49.
  • Cote D'Ivoire 2021 Female and Household: Women aged 15-49.
  • Ethiopia 2014 Round 1 Female and Household: Women aged 15-49.
  • Ethiopia 2014 Round 2 Female and Household: Women aged 15-49.
  • Ethiopia 2015 Round 3 Female and Household: Women aged 15-49.
  • Ethiopia 2016 Round 4 Female and Household: Women aged 15-49.
  • Ethiopia 2017 Round 5 Female and Household: Women aged 15-49.
  • Ethiopia 2018 Round 6 Female and Household: Women aged 15-49.
  • Ethiopia 2019 PMAET Female and Household: Women aged 15-49.
  • Ethiopia 2020 Round 6 Female Follow-up: Women aged 15-49.
  • Ghana 2014 Round 2 Female and Household: Women aged 15-49.
  • Ghana 2014 Round 3 Female and Household: Women aged 15-49.
  • Ghana 2015 Round 4 Female and Household: Women aged 15-49.
  • Ghana 2016 Round 5 Female and Household: Women aged 15-49.
  • Ghana 2017 Round 6 Female and Household: Women aged 15-49.
  • India 2016 (Rajasthan) Round 1 Female and Household: Women aged 15-49.
  • India 2017 (Rajasthan) Round 2 Female and Household: Women aged 15-49.
  • India 2017 (Rajasthan) Round 3 Female and Household: Women aged 15-49.
  • India 2018 (Rajasthan) Round 4 Female and Household: Women aged 15-49.
  • India 2020 (Rajasthan) Female and Household: Women aged 15-49.
  • India 2021 (Rajasthan) Female and Household: Women aged 15-49.
  • Indonesia 2015 Round 1 Female and Household: Women aged 15-49.
  • Indonesia 2016 Round 2 Female and Household: Women aged 15-49.
  • Kenya 2014 Round 1 Female and Household: Women aged 15-49.
  • Kenya 2014 Round 2 Female and Household: Women aged 15-49.
  • Kenya 2015 Round 3 Female and Household: Women aged 15-49.
  • Kenya 2015 Round 4 Female and Household: Women aged 15-49.
  • Kenya 2016 Round 5 Female and Household: Women aged 15-49.
  • Kenya 2017 Round 6 Female and Household: Women aged 15-49.
  • Kenya 2018 Round 7 Female and Household: Women aged 15-49.
  • Kenya 2019 Female and Household: Women aged 15-49.
  • Kenya 2020 Female and Household: Women aged 15-49.
  • Kenya 2021 Female and Household: Women aged 15-49.
  • Niger 2015 (Niamey) Round 1 Female and Household: Women aged 15-49.
  • Niger 2016 Round 2 Female and Household: Women aged 15-49.
  • Niger 2016 (Niamey) Round 3 Female and Household: Women aged 15-49.
  • Niger 2017 Round 4 Female and Household: Women aged 15-49.
  • Niger 2018 Round 5 Female and Household: Women aged 15-49.
  • Niger 2020 Phase 1 Female and Household: Women aged 15-49.
  • Niger 2022 Phase 2 Female and Household: Women aged 15-49.
  • Nigeria 2014 (Kaduna) Round 1 Female and Household: Women aged 15-49.
  • Nigeria 2014 (Lagos) Round 1 Female and Household: Women aged 15-49.
  • Nigeria 2015 (Kaduna) Round 2 Female and Household: Women aged 15-49.
  • Nigeria 2015 (Lagos) Round 2 Female and Household: Women aged 15-49.
  • Nigeria 2016 Round 3 Female and Household: Women aged 15-49.
  • Nigeria 2017 Round 4 Female and Household: Women aged 15-49.
  • Nigeria 2017 (Oyo) Round 1 Female and Household: Women aged 15-49.
  • Nigeria 2018 Round 5 Female and Household: Women aged 15-49.
  • Nigeria 2019 (Kano) Female and Household: Women aged 15-49.
  • Nigeria 2019 (Lagos) Female and Household: Women aged 15-49.
  • Nigeria (Kano) 2020 Female and Household: Women aged 15-49.
  • Nigeria (Lagos) 2020 Female and Household: Women aged 15-49.
  • Nigeria (Kano) 2021 Female and Household: Women aged 15-49.
  • Nigeria (Lagos) 2021 Female and Household: Women aged 15-49.
  • Uganda 2014 Round 1 Female and Household: Women aged 15-49.
  • Uganda 2015 Round 2 Female and Household: Women aged 15-49.
  • Uganda 2015 Round 3 Female and Household: Women aged 15-49.
  • Uganda 2016 Round 4 Female and Household: Women aged 15-49.
  • Uganda 2017 Round 5 Female and Household: Women aged 15-49.
  • Uganda 2018 Round 6 Female and Household: Women aged 15-49.
  • Uganda 2019 Female and Household (R6 Follow up): Women aged 15-49.
  • Uganda 2020 Female and Household: Women aged 15-49.
  • Uganda 2021 Female and Household: Women aged 15-49.

Availability

  • Burkina Faso: 2014-2018, 2020-2022
  • Congo (Democratic Republic): 2014-2021
  • Cote d'Ivoire: 2017-2018, 2020-2021
  • Ethiopia: 2014-2020
  • Ghana: 2014-2017
  • India: 2016-2018, 2020-2021
  • Indonesia: 2015-2016
  • Kenya: 2014-2021
  • Niger: 2015-2018, 2020, 2022
  • Nigeria: 2014-2021
  • Uganda: 2014-2021