Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Months of use of the current contraceptive method are calculated from the calendar and other variables for model "A" questionnaires, or are taken directly from the questionnaire for model "B" questionnaires, and from the date of sterilization for women who are sterilized or whose partners are sterilized. For model "B" questionnaires, if the months of use are missing, unknown or inconsistent, then this variable is set likewise.
For Model "B" questionnaires, if the number of months of use exceeds 8 years, it is coded as 96. For Model "A" questionnaires, the month of interview is ignored in calculating the duration of current use.