Chart 4 examines the changes in vigintile ( 1/20th or 5% ) for the SIMD and the domains between the 2006 and 2009 SIMD publications. Vigintiles are bands of 5%, ie vigintile 1 is the 5% most deprived and combining the first three vigintiles is the 15% most deprived datazones in Scotland. […] No datazone had a decrease in the vigintile category for either income or employment domain. The income domain had one datazone remaining in the same category, three datazones increasing by one vigintile category and one datazone increasing by two vigintiles.
Source: wiktionary