That could mean that fat in the diet may have a small effect, Dr. Rossouw said, perhaps in some subgroups of women or over a longer period of time.

这可能意味着饮食中的脂肪可能有小小的影响，罗斯博士说，也许在某些亚群或要一段更长的时间才有作用效果。

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Alternatively, compute an effect measure for each individual participant which incorporates all time points, such as total number of events, an overall mean, or a trend over time.

选择计算总和了每个参与者全部时间点的一个作用指标，例如，事件的总数、总平均值或者时间趋势。

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HHT has not been put forward for long time, so it contains some theoretical problems, such as envelop and mean curve fit, boundary effect, modes mix and so on.

HHT刚提出不久，其理论本身还存在不少问题，如包络线和均值曲线的拟合、边界效应和模态混叠等问题。

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In addition, the act of breastfeeding has a contraceptive effect which would mean that in the past a teenager would be unable to become pregnant for a second time while feeding her first child for several years.

BBC: Second-time teen mothers at risk