Descriptive statistics by each level of Time To First Cigarette (TTFC) after waking.
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Descriptive statistics by each level of Time To First Cigarette (TTFC) after waking.
针对醒来后至第一支烟的间隔时间（Time To First Cigarette, TTFC）的各层级开展描述性统计分析。
创建时间：
2020-05-22
