The reliability and predictive validity of the Heaviness of Smoking Index and its two components: Findings from the International Tobacco Control Four Country study
The reliability and predictive validity of the Heaviness of Smoking Index and its two components: Findings from the International Tobacco Control Four Country study
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DOI：
10.1093/ntr/ntq038
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发表时间：
2010-10-01
影响因子：
4.7
通讯作者：
Thompson, M. E.
中科院分区：
文献类型：
--
作者：
Borland, R.;Yong, H. -H.;Thompson, M. E.
人们越来越认识到，吸烟重度指数 (HSI) 中的两项指标，即每天吸第一支烟的时间 (TTFC) 和每日消费量（每天香烟数量 [CPD]）是戒烟行为的有力预测指标。使用国际烟草控制队列的第 1-4 波（每波约 8,000 名受访者）和 6,000 名受访者来预测下一波的戒烟结果。我们测量了每一波的 TTFC 和 CPD，并在下一波中测量了戒烟结果。我们还研究了标准分类评分与使用 CPD 的平方根减去 TTFC 的自然对数（以分钟为单位）的连续评分相比的相对效用。我们发现多年来的测量结果具有相当大的一致性，并且随着测量之间的持续时间增加而略有下降。对于 3 年差距，连续和分类综合 HSI 指标的相关性分别为 0.72 和 0.70，而单个成分的相关性至少为 0.63。 TTFC 和 CPD 均独立预测了三轮重复中每次戒烟尝试的维持（至少 1 个月），并且在控制人口因素时，这些效应得以维持。 CPD 还预测了持续的尝试，但 TTFC 的结果并不总是显着。随着时间的推移，TTFC 和 CPD 都相当可靠，并且是戒烟的重要预测因素。计算分数的方式影响很小，两个项目可以单独使用，也可以组合起来作为HSI。
There is increasing recognition that the two measures in the Heaviness of Smoking Index (HSI), time to first cigarette of the day (TTFC) and daily consumption (cigarettes per day [CPD]), are strong predictors of quitting behavior.Use of Waves 1-4 of International Tobacco Control cohort with around 8,000 respondents per wave and 6,000 for prediction of quit outcomes at the next wave. We measured TTFC and CPD at each wave and quit outcomes at the next wave. We also looked at the relative utility of the standard categorical scoring compared with a continuous score using the square root of CPD minus the natural log of TTFC in minutes.We found considerable consistency of the measures across years with a small decrease as duration between measurements increased. For a 3-year gap, the correlations were .72 and .70 for the continuous and categorical composite HSI measures, respectively, and were at least .63 for the individual components. Both TTFC and CPD independently predicted maintenance of quit attempts (for at least 1 month) in each of the three wave-to-wave replications, and these effects were maintained when controlling for demographic factors. CPD also predicted making attempts consistently, but the results for TTFC was not consistently significant.Both TTFC and CPD are fairly reliable over time and are important predictors of quitting. There are only small effects of mode of computing the scores, and the two items can be used either individually or combined as the HSI.