National Demographic Survey 1973
Five years after the first National Demographic Survey (NDS) was accomplished, the second NDS was envisioned as another joint project of the University of the Philippines Population Institute (UPPI) and the Bureau of Census and Statistics (BCS, now known as the National Statistics Office). The 1973 NDS is a countrywide, representative sample of the nation's households, covering a total of 8,434 units, which in turn contained 52,760 persons in May 1973. Of these, 28,482 were aged 15 or above and 9,412 were ever‑married females. This survey was designed to elicit information on household characteristics; work activity; geographic, job and social mobility; fertility; marriage experience; work experience since marriage; and family planning knowledge, attitudes and practices. Much of these information are available for each person aged 15 and over in the sample. Other information are available only for ever‑married or currently‑married females aged 15 years and over.
The survey conducted during the period May‑June, 1973 made use of 10% of the sample households from the BCS Labor Force Quarterly Survey's sample enumeration districts (EDs). Of this sample, about 2/3 of the original households in each ED or about a total of 8,000 households were drawn for the survey. All ever‑married women in the sample were personally interviewed using a revised and expanded 1968 NDS questionnaire.
From the BCS Labor Force Quarterly Survey, one sample ED was randomly selected from chosen sample municipalities, with the exception of Manila and its suburbs which were allotted different sample EDs. From each sample ED, a 10% household sample is selected systematically with a random start.