This increase is also illustrated, in part, by the overall change in mean scores for emotional symptoms shown in Table 4.2 (a very slight increase of 1.2 to 1.3). (gov.scot)
First, mean scores on temperament dimensions and scales were compared between the referred and population group using independent samples t tests. (link.springer.com)
However, by 1999, the gap in mean scores by race had expanded to about 0.8 standard deviations. (sciencemag.org)