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.
PTRDK indicates whether the respondent said, in response to an open-ended question, that she did not know of any way to make water safe to drink.
The information in PTRDK is taken from the household record, linked to the record of the woman respondent. This information applies to household residents, not temporary visitors, so researchers may wish to exclude visitors using the RESIDENT variable (with visitors coded "2").