Which occupation in China gets the best sleep?

A well-rested work force is the driver of successful commerce.  But which occupation in China gets the best beauty rest?

Researchers from 10 U.S. and Chinese univerities set out to answer the question, collecting data from 18,316  Chinese workers of various occupations aged 18-65.

The analysis found farmers, known for their early mornings, surprisingly got the most sleep with an average of 8.22 hours each night.

On the other end of the spectrum, Civil servants were found slumbering the least with an average of 7.85 hours a night.

Applying the Pittsburgh Sleep Quality Index (PSQI), a questionaire that registers the psychological symptoms of sleep, they also determined farmers had the highest quailty of sleep.

In this area, white-collar proffessionals had the worst score in terms of quality.

Blue collar workers scored the lowest overall score when factoring age, sex, marital status, education, area, smoking, drinking, pain, and health status.

“blue collar workers are more likely to have shortened sleep duration and poor sleep quality,” the study, Sleep Duration and Quality among Different Occupations–China National Study, said.

It was published by the Public Library of Science on March 17.

Scientists start debate over China origins of modern domesticated Chickens

Scientists have refuted a recently published study that traced the first domesticated chickens to China more than 10,000 years ago, in a paper that says the data used in the first study was “overinterpreted”.

Researchers from Yunnan Laboratory of Molecular Biology of Domestic Animal and the Kunming Institute of Zoology rexamined the data used to track the  origins of the domesticated chicken and  determined there is too much room for error for their prediction.

The original study, published in December 2014, examined mitochondrial DNA extracted from ancient chicken bones found in the Nanzhuangtou archeological site.

Scientists led by China Agricultural University then used DNA analysis  to link ancient and modern chicken  DNA.

”Our results suggest that these early domesticated chickens contributed to the gene pool of modern chicken populations,” the orignal study, Early Holocene chicken domestication in northern China, said.

However, researchers from the Yunnan Labratory said the methods they used were not precise.

“They proposed that the chicken was domesticated in northern China as early as 10,000 y ago. However, a reanalysis of their data suggested that the data are overinterpreted,” the latest paper, Caveats about interpretation of ancient chicken mtDNAs from northern China, said.

Both were published online by the Proceedings of the National Academy of Sciences of the United States of America.