但是，布兰奇·弗劳尔和奥斯·瓦尔德先生在另一项名为“年轻人日益增高的幸福感”的课题研究中发现，对于那些30岁以下的人来说，幸福感会因孩子和兄弟姊妹的增多而成比例地下降。

But for those under 30, happiness decreases proportionately to the number of both children and siblings. Blanchflower and Mr. Oswald found it in a separate study, "the Rising Well-Being of the Young".

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