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.
For women who had ever been married or lived with a man, YRSTO1STMAR (V512) reports the number of years from the start of the woman's first marriage/union to the date of the survey interview. The calculation is made using century month codes for both dates.
For the month and year of first marriage/union, see MAR1STMO (V507) and MAR1STYR (V508) respectively.