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第73行：
第73行： − 例如，在估算新生儿死亡和体外受精后出生体重时，按妊娠期长度和/或多胎次数与对照组相匹配是过度匹配的，因为体外受精本身会增加早产和多胎的风险。+ − 第81行：
第80行： − 它可以被看作是一个减少研究外部效度的抽样偏差，因为在暴露方面，控制变得比一般人群更加类似于案例。+
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For example, matching the control group by gestation length and/or the number of multiple births when estimating perinatal mortality and birthweight after in vitro fertilization (IVF) is overmatching, since IVF itself increases the risk of premature birth and multiple birth.
For example, matching the control group by gestation length and/or the number of multiple births when estimating perinatal mortality and birthweight after in vitro fertilization (IVF) is overmatching, since IVF itself increases the risk of premature birth and multiple birth.
例如，在估计体外受精（IVF）后的围产期死亡率和出生体重时，按妊娠期和/或多胎数来匹配对照组就是过度匹配，因为IVF本身会增加早产和多胎的风险。
It may be regarded as a sampling bias in decreasing the external validity of a study, because the controls become more similar to the cases in regard to exposure than the general population.
It may be regarded as a sampling bias in decreasing the external validity of a study, because the controls become more similar to the cases in regard to exposure than the general population.
它可以被看作是一个降低研究外部效度的抽样偏误，因为相比一般人群，对照组在暴露方面变得更类似于。