Those in the control group not only didn't see a grade increase, they had lower grades than the grading before the study began.

对照组的学生不仅成绩没有提高，而且比研究开始前的成绩还要低。

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The trait types of stabilized-introversion in Study Group were significantly lower than those in Control Group(P<0.01).

个性特质方面，不稳定-外向型显著高于对照组（P<0.01），而稳定-内向型显著低于对照组（P<0.01）。

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The low birth-weight and fetal macrosmia in the study group was significantly lower than those of the control group(P<0.05).

两组新生儿出生体重比较，研究组低体重儿、巨大儿出生率明显低于对照组，P<0.05。

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"The difference between those who enjoyed life the most and those who enjoyed life the least was marked, with nearly three times more people dying in the lower than greater enjoyment group, " the study said.

BBC: Enjoyment of life 'key to living longer'