Editing DevCon (section)

==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):

'''Questions'''
*<u>Question B1B</u>: 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?

* <u>Question B1C</u>: 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)

'''Recoding and Transforming'''

Question B1B was recoded from ordinal to numeric variable of days smoked in 365 days using the following conversions.
* 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

'''Combining Variables'''

The recoded question B1B was then multiplied by B1C, and divided result by 365 to get average cigarettes per day over the last 12 months.


After data cleaning, the distributions of these variables looked like this: 


[[File:CTS CPD.jpeg|frameless|border|Caption can go here]]
[[File:LTSCPD.jpeg|frameless|border|Caption can go here]]


Changes over time to average CPD:


[[File:CTS CPD Spaghetti.jpeg|frameless|border|CTS]]
[[File:LTS CPD Spaghetti.jpeg|frameless|border|LTS]]

To examine the correlation between computed CPD variables over the waves, measures were log-transformed, controlling for sex.

'''CTS Variables'''

[[File:Cpdctssex.jpeg|frameless|border|CTS CPD]]
{| class="wikitable"
|+Sex-Controlled CTS Cigs Per Day Variable Correlations (Log-Transformed)
|-
! !! Wave 1 Computed !! Wave 2 Computed
|-
| Wave 1 Computed || 1 ||
|-
| Wave 2 Computed || .66 || 1 
|-
|}


'''LTS Variables'''

[[File:Cpdltssexvar.jpeg|frameless|border|LTS CPD]]
{| class="wikitable"
|+Sex-Controlled LTS Cigs Per Day Variable Correlations (Log-Transformed)
|-
! !! Wave 1 Computed !! Wave 2 Computed
|-
| Wave 1 Computed || 1 ||
|-
| Wave 2 Computed || .2 || 1 
|-
|}