DevCon
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Phenotypes
Cigarettes per Day
CADD
In CADD sufficient information to calculate CPD was present only at Waves 2 and 3 in LTS and CTS. We used the following questions from the CIDI-SAM (only asked to participants who smoked at least 20 cigarettes in lifetime AND smoked in the past 12 months):
- Question B1B: How would you describe your usual pattern of cigarette smoking in the past 12 months? Would you describe it as...
- Every day?
- 5 or 6 days a week?
- 3 or 4 days a week?
- 1 or 2 days a week?
- 1 to 3 days a month
- Less than once a month?
- Question B1C: In the past 12 months when you were smoking cigarettes (FREQUENCY IN B1B), how many would you usually smoke in a day? IF MORE THAN 95, CODE 96: ______ (# Cigarettes)
Question B1B was recoded from an ordinal variable to a numeric variable of number of days smoked in last 365 (last year) as follows:
- Every day -> 365 days
- 5 or 6 days a week -> 286 days/year (5.5 days/week * 52 weeks/year)
- 3-4 days a week -> 182 days/year (3.5 days/week * 52 weeks/year)
- 1-2 days a week -> 78 days/year (1.5 days/week * 52 weeks/year)
- 1-3 days a month -> 24 days/year (.46 days/week * 52 weeks / year)
- Less than once a month -> NA
Multiplied B1B recoded and B1C, and divided result by 365 to get average CPD over last 12 months.
After data cleaning, the distributions of these variables looked like this:
