Also, they were mostly observational studies. An observational study is where researchers do not do controlled comparisons. They only describe what they observe. So they might observe a link that students who are more active often have better grades. But that does not necessarily mean being active was the cause of those higher grades.
并且它们大多数是观察性研究。观察性研究是指研究人员不作对照比较，只描述他们的观察结果。所以他们可能观察到体育锻炼更多的学生成绩更好。但那不一定意味着进行体育锻炼是取得更高分的原因。
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Still, the general finding was that physically active kids are more likely to do better in school. Ms. Singh says schools should consider that finding before they cut physical education programs. Her paper on "Physical Activity and Performance at School" is published in the Archives of Pediatric and Adolescent Medicine.
尽管如此，总的结论是，喜欢运动的孩子更可能在学校表现更好。辛格女士说，学校应该在削减体育课之前，考虑一下这一研究发现。她的“体育锻炼和学校表现”一文发表在《儿科和青少年医学文献集》上。
