Is calculating pack-years retrospectively a valid method to estimate life-time tobacco smoking? A comparison between prospectively calculated pack-years and retrospectively calculated pack-years
Is calculating pack-years retrospectively a valid method to estimate life-time tobacco smoking? A comparison between prospectively calculated pack-years and retrospectively calculated pack-years
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DOI：
10.1046/j.1360-0443.2001.9611165311.x
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发表时间：
2001-11-01
期刊：
影响因子：
6
通讯作者：
Kemper, HCG
中科院分区：
文献类型：
--
作者：
Bernaards, CM;Twisk, JWR;Kemper, HCG
目标。通过比较回顾性计算包年（py-retro）与前瞻性计算包年（py-pro），研究回顾性计算包年（py-retro）的相对有效性。设计一项持续23年的队列研究（1977-2000）。参与者男女各154人，1977年13岁，2000年36岁。设置.阿姆斯特丹，荷兰。测量.为了计算py-pro，在23年的时间里，通过访谈或问卷调查，对目前的吸烟和戒烟努力进行了9次调查。在36岁时，受试者填写了一份关于他们吸烟史的综合问卷，以计算py-retro。计算py-pro和py-retro之间的个体差异。此外，在将py-pro和py-retro分为三组后计算Cohen kappa。调查结果。(1)Py-retro不会低估或高估终身吸烟。(2)由于py-pro和py-retro之间存在较大的个体差异，py-retro的相对有效性为中等。(3)包年数越高，两种方法的个体差异越大。(4)当平均包年为
Aims. To investigate the relative validity of retrospectively calculated pack-years (py-retro) by comparing py-retro with prospectively calculated pack-years (py-pro). Design. A 23-year ongoing cohort study (1977-2000). Participants. One hundred and fifty-four males and females, 13 years old in 1977 and 36 years old in 2000. Setting. Amsterdam, the Netherlands. Measurements. To calculate py-pro, current smoking and quitting efforts were investigated nine times in a period of 23 years with the help of an interview or a questionnaire. At the age of 36, subjects filled out a comprehensive questionnaire about their smoking history, to calculate py-retro. Individual differences between py-pro and py-retro were calculated. In addition, Cohen's kappa was calculated after categorising py-pro and py-retro into three groups. Findings. (1) Py-retro does not under- or overestimate life-time tobacco smoking. (2) The relative validity of py-retro was moderate due to large individual differences between py-pro and py-retro. (3) The individual differences between py-pro and py-retro became larger, the higher the number of pack-years. (4) Mean difference (and 95% limits of agreement) between py-pro and py-retro was -0.039 ( -5.23, 5.32) when average pack-years was