I love this nonsense, without the SD the 'average' figure is completely meaningless. Could have been one guy in the study with an IQ 1000 times that of his brother in a coma. Grrr.

“I consider these two papers the most important publications to come out in this field in 70 years; it’s a dream come true,” said Frank J. Sulloway, a psychologist at the Institute of Personality and Social Research at the University of California, Berkeley.

If that is the case, then it might show that younger brothers are more likely to be in a coma.