expected sex ratio

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• Operational sex ratio — In the evolutionary biology of sexual reproduction, the operational sex ratio (OSR) is the ratio of sexually competing males that are ready to mate to sexually competing females that are ready to mate.[1][2] It is different from the physical sex… …   Wikipedia

• Sex-selective abortion and infanticide — Sex selective abortion is the targeted abortion of a fetus based upon its sex. This is done after a determination is made (usually by ultrasound but also rarely by amniocentesis or another procedure) that the fetus is of an undesired sex. Sex… …   Wikipedia

• Sex-selective abortion — is the practice of terminating a pregnancy based upon the predicted sex of the baby. The selective abortion of female fetuses is most common in areas where cultural norms value male children over female children,[1] especially in parts of People… …   Wikipedia

• ratio — An expression of the relation of one quantity to another ( e.g., of a proportion or rate). SEE ALSO: index (2), quotient. [L. r. (ration ) a reckoning, reason, fr. reor, pp. ratus, to reckon, compute] absolute terminal innervation r. the number… …   Medical dictionary

• Sex and psychology — This article is about psychology and the male and female biological sexes. For information about human sexual perceptions, see Human sexuality. Research on sex and psychology investigates cognitive and behavioral differences between men and women …   Wikipedia

• Standardized mortality ratio — The standardized mortality ratio or SMR in epidemiology is the ratio of observed deaths to expected deaths, where expected deaths are calculated for a typical area with the same age and gender mix by looking at the death rates for different ages… …   Wikipedia

• standardized mortality ratio — (SMR) the ratio of the number of observed deaths in a study population to the number of expected deaths in that population. The expected deaths are calculated by classifying the study group by demographic variables such as age, sex, or race;… …   Medical dictionary

• Waist-hip ratio — or Waist to hip ratio (WHR) is the ratio of the circumference of the waist to that of the hips. It is calculated by measuring the waist circumference (located just above the upper hip bone) and dividing by the hip circumference at its widest part …   Wikipedia

• china — /chuy neuh/, n. 1. a translucent ceramic material, biscuit fired at a high temperature, its glaze fired at a low temperature. 2. any porcelain ware. 3. plates, cups, saucers, etc., collectively. 4. figurines made of porcelain or ceramic material …   Universalium

• China — /chuy neuh/, n. 1. People s Republic of, a country in E Asia. 1,221,591,778; 3,691,502 sq. mi. (9,560,990 sq. km). Cap.: Beijing. 2. Republic of. Also called Nationalist China. a republic consisting mainly of the island of Taiwan off the SE coast …   Universalium

• United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …   Universalium