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Former smoking was defined as having smoked at least 100 cigarettes in one's lifetime but not currently smoking.
We classified participants' smoking status at each visit as never smoked, smoking cessation (namely, former smoking), and current smoker.
The impact of active and former smoking on the severity of obstructive sleep apnea.
DESIGN This multicenter, prospective, noninterventional data-collection study enrolled 149 individuals aged ≥40 years with current or former smoking history.
Smoking was defined as current or former smoking habit.
Finally, the SC phenotype was defined as a binary trait comparing "former smoking" and "current smoking".
There was no statistical evidence of an association between former smoking and CRC for both sexes.
Similarly, current and former smoking was coded with indicator variables with no smoking designated as the referent category.
The former smoking rate was 12.3%.
Former smoking status was not captured.
Smoking status (former smoking vs smoker) was described by multilevel correlates of former smoking.
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