MATRESYN indicates whether the household has a mattress. The complementary variable MATRESNUM reports the number of mattresses owned by the household.
The related variable BED indicates whether the household has a bed.
The information in MATRESYN 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").