DevCon

Slides and notes from meetings

DevCon 6/15/16 CADD & MLS

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 B1B recoded: Transformed from ordinal to numeric variable of days smoked in last 365:
  • 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

• 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)

Combining variables:

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:

FTP

CPD is only available for parents of target individuals (G1 generation). Measures of alcohol/tobacco use frequency only are available for the G2 generation.

• Question XtobMo: For wave X, past month frequency of tobacco use (targets and target sibs ONLY):
  • 1 = Less than once a week
  • 2= 1-2 times a week
  • 3= 3-4 times a week
  • 4= 5-6 times a week
  • 5 = Every day

• Question Xtob: For wave X, current tobacco use (parents of targets ONLY):
  • 1= Yes
  • 2= No

• Question Xcig: For wave X, current cigarettes per day (parents of targets ONLY): # Cigarettes