“…Indeed, prior research has documented some of these important determinants. They include, but are not limited to, social and economic change, changing attitudes toward family size, increase in educational attainment, increase in women's labor force participation, pre-existing demand for deliberate birth control, increase in age at first marriage, postpartum abstinence, contraceptive usage, a vigorous and organized family planning program, and the absence of pronatalist props and major cultural barriers (Knodel et al, 1980;Knodel et al, 1987;Knodel et al, 1988;Yoddumnern-Attig, 1992;Limanonda, 1995;Knodel et al, 1996;Chamratrithirong et al, 1997).…”