Source:http://linkedlifedata.com/resource/umls/id/C0237881
NCI: In statistics, a number that expresses the probability that the result of a given experiment or study could have occurred purely by chance. This number can be a margin of error or it can indicate a confidence level. (from Bartleby.com),NCI: Describes a mathematical measure of difference between groups. The difference is said to be statistically significant if it is greater than what might be expected to happen by chance alone.