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What is the percentage of chance of giving birth to a boy child and girl child by a couple respectively?
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Answers
Answer:
In most industrialized countries about 105 boys are born for every 100 girls, for a ratio of 1.05, known as the secondary sex ratio, or SSR; the primary sex ratio is the ratio at conception. This is often expressed as the percentage of boys among all births, or about 51.2 percent. Thus, the short answer to the question is: "On average, no." The percentage of males among all births is not fixed, however. Since the 1950s and 1960s the overall SSR has been declining in the U.S., Canada and several European countries, but some groups display different trends. In the U.S., the SSR is declining for whites, whereas among African-Americans and other races, the SSR has been increasing since the 1960s. Currently the SSR among African-Americans in the U.S. is only about 50.7 percent. There are also both personal and environmental factors that affect the average sex ratio.
The chance of having a boy appears to decline with the mother's age, the father's age and the number of children the family already has. These effects are small. One study in Denmark found that the SSR of children born to fathers younger than 25 was 51.6 percent, which decreased to 51.0 percent among children of fathers at least 40 years of age. Therefore it is unlikely that the declining SSR in many countries results solely from large-scale changes in such personal factors.