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Date last obtained FP method in century month

FPLASTCMC is a 4-digit variable that represents the century-month value (months since 1900) of the date on which the woman last obtained her most recent family planning method. The following values represent NIU (not in universe) or missing cases:

9000 = Logical edit - missing
9995 = Not interviewed (female questionnaire)
9996 = Not interviewed (household questionnaire)
9999 = NIU (not in universe)


FPLASTCMC reports the century month code (CMC) for when the woman last obtained her most recent family planning method.

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.

There are a number of cases in which an invalid year was recorded in FPLASTYR e.g. a value of 2021. IPUMS has recoded these cases to "Logical edit - missing."

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


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).


There are no comparability issues.


  • Women age 15-49 who are currently using an FP method or have used an FP method within the past 12 months.


  • Indonesia: 2015