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Chinese Lunar Calendar Method Cannot Accurately Predict Baby's Sex

by VR Sreeraman on May 26, 2010 at 3:39 PM
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 Chinese Lunar Calendar Method Cannot Accurately Predict Baby's Sex

The so-called Chinese Lunar Calendar method of predicting a baby's sex is no more accurate than flipping a coin, a University of Michigan epidemiologist suggests.

Dr. Eduardo Villamor of the U-M School of Public Health and colleagues in Sweden and Boston reviewed records of 2.8 million Swedish births, between 1973 and 2006, to test the accuracy of the Chinese lunar calendar method.


The technique involves converting the mother's age and the month of conception to dates on the Chinese lunar calendar, then plugging those dates into a chart that purportedly predicts the baby's sex.

Conversion tables and Chinese birth charts are available on numerous websites and continue to grow in popularity.

The Chinese lunar calendar method is said to be based on an ancient chart that was buried in a tomb near Beijing for nearly 700 years, according to one of the websites.

"The whole thing sounds pretty nonsensical. There is no information on the rationale behind the chart and we couldn't think of a biological basis for it. Even though we were skeptical, we tried to keep an open mind, and we just analyzed the data to see if there is anything to it. There isn't," said Villamor.

Some of the Chinese lunar calendar websites claim accuracy rates of up to 93 percent.

But when Villamor and his colleagues compared the Swedish birth records to the charts' predictions, they found that the Chinese charts were correct about 50 percent of the time---the same chance agreement rate you'd get from flipping a fair coin.

"We found that the accuracy of the Chinese lunar calendar method for the prediction of a baby's sex leaves much to be desired," the authors said.

"We conclude that the CLC method is no better to predict the sex of a baby than tossing a coin and advise against painting the nursery based on this method's result," the authors added.

The study was scheduled to be published in the May edition of the journal Paediatric and Perinatal Epidemiology.

Source: ANI
SRM

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