该研究小组包括新加坡国立大学及上海癌症研究所的研究人员，将尿中NNAL水平分为低、中和高三类。
The team, which included researchers at the National University of Singapore and the Shanghai Cancer Institute, divided NNAL urine levels into low, medium and high categories.
包括癌症这样的许多健康问题都被记录在册，因此研究人员就简单地把注册表上的居民分为电话用户和非电话用户并且将这两组进行了对比。
Many health outcomes, including cancer, are recorded in the registry, so the researchers simply broke the population into phone subscribers and non-subscribers and compared the two groups.
包括癌症这样的许多健康问题都被记录在册，因此研究人员就简单地把注册表上的居民分为电话用户和非电话用户并且将这两组进行了对比。
Many health outcomes, including cancer, are recorded in the registry, so the researchers simply broke the population into phone subscribers and non-subscribers and compared the two groups.
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