title: The influence of birth order, maternal age on sex ratio at birth in Greater Bombay.
abstract: "The present paper aims to find out the influence of birth order and maternal age on sex ratio at birth in Greater Bombay [India] by considering 1.5 million births during the period 1970-78.  The relationship sex ratio at birth has [with] birth order and maternal age follows a quadratic model."  The percentage variation explained by a linear model is less than that explained by the quadratic model.
authors.forename: C P
authors.initials: CP
authors.lastname: Prakasam
authors.forename: V S
authors.initials: VS
authors.lastname: Sastry
mesh_terms: D000367:Age Factors; D001208:Asia; D001722:Birth Order; D003710:Demography; D003906:Developing Countries; D005191:Family Characteristics; D005195:Family Relations; D007194:India; D008423:Maternal Age; D008962:Models, Theoretical; D010290:Parents; D011153:Population; D011154:Population Characteristics; D012106:Research; D017678:Sex Distribution; D012737:Sex Factors; D012744:Sex Ratio
keywords: Age Factors; Asia; Birth Order; Demographic Factors; Developing Countries; Family And Household; Family Characteristics; Family Relationships; India; Maternal Age; Mathematical Model; Models, Theoretical; Parental Age; Population; Population Characteristics; Research Methodology; Sex Distribution; Sex Factors; Sex Ratio; Southern Asia