月球运动里因太阳和地球引力的联合作用而产生的周期为半个朔望月的摄动项。
对连续性数据及二分法的数据各自以标准平均差及相对风险来比较。
The standardised mean difference and relative risk were used for continuous data and dichotomous data comparisons, respectively.
相对危险是用来总结二分法的结果，而标准化平均差及平均差这两者整合了连续的测量值。
Relative risk was used to summarise dichotomous outcomes and both the standardised mean difference and mean difference to summarise continuous measures.
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