||The Household Questionnaire listed all usual residents of each sampled household and all visitors who had slept in the household the night before the interview. For every person listed, some basic information such as their relationship to the head of the household, sex, age, education, and marital status was collected. The main purpose of this section of the Household Questionnaire was to identify women who were eligible for the individual interviews, that is, ever-married women age 15 to 49 years. In addition, the Household Questionnaire also obtained information on the source of water, type of toilet facilities, rooms used for sleeping, main materials of the floor, ownership of various consumer durable goods, and characteristics of household heads such as religion and ethnicity. In addition, the salt used in each household was tested for its iodine content.