title: Parental age, birth order and tertiary sex ratio in the human population of Punjab, Pakistan.
mesh_terms: D000367:Age Factors; D001208:Asia; D001722:Birth Order; D003625:Data Collection; D003710:Demography; D003906:Developing Countries; D005191:Family Characteristics; D005195:Family Relations; D008423:Maternal Age; D010154:Pakistan; D010290:Parents; D011153:Population; D011154:Population Characteristics; D012106:Research; D012494:Sampling Studies; D017678:Sex Distribution; D012737:Sex Factors; D012744:Sex Ratio; D014798:Vital Statistics
keywords: Age Factors; Asia; Birth Order; Demographic Factors; Developing Countries; Family And Household; Family Characteristics; Family Relationships; Maternal Age; Pakistan; Parental Age; Population; Population Characteristics; Population Statistics; Research Methodology; Sampling Studies; Sex Distribution; Sex Factors; Sex Ratio; Southern Asia; Studies; Surveys; Vital Statistics