The factors reducing behavioral problems of school-age children with asthma involved the first onset age, the actual proportion of learning time and the daily mean duration of outdoors activity.

减轻学龄期哮喘患儿行为问题的因素有：首次发病年龄、患儿坚持学习与应学习时间比例及一天平均户外活动时间。

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"This is the first time anyone has shown that a single parkin mutation can lower the age of onset, " said Dr James Gusella, study leader and director of the Massachusetts General Hospital Center for Human Genetic Research.

BBC: NEWS | Health | Gene 'predicts' Parkinson's onset