Editing DevCon (section)

==CADD==

Waves 1-3 of CTS and LTS were used to create drinks per week measures. There is a computed variable for Waves 1 and 2 and a measured variable for Waves 2 and 3:

'''Computed Variable:''' 

Questions from the CIDI-SAM supplement and the Monitoring the Future (MTF) Questionnaire were used to compute a drinks per week variable for Waves 1 and 2. Individuals who indicated never drinking were set to missing. Individuals who indicated drinking but not in the last 180 days were set to 0.

*<u>Question SAMX2F (supplement):</u> How many days have you used alcohol in the past 6 months (180 days)? # Days

*<u> Question MTF7 (MTF):</u> When you drink, how many drinks do you usually have at a single occasion?
** 1
** 2
** 3-4
** 5-10
** 10 or more

'''Recoding and Transforming:'''

Question MTF7 was recoded from ordinal to numeric variable of drinks at a typical occasion using the following conversions.
** 1 -> 1
** 2 -> 2
** 3-4 -> 3.5
** 5-10 -> 7.5
** 10+ -> 10

'''Combining variables:'''

Divided # of days drunk in last 180 by 26 to get days drunk in typical week, then multiplied by recoded # of drinks at typical occasion to get typical drinks per week.


After data cleaning, the distribution of the computed variable looked like this:


[[File:CTS12DPW.jpeg|frameless|border|Caption can go here]]
[[File:LTS12DPW.jpeg|frameless|border|Caption can go here]]


Change over time to DPW:

[[File:CTS DPW12 Spaghetti.jpeg|frameless|border|CTS 1-2 DPW]]
[[File:LTS DPW12 Spaghetti.jpeg|frameless|border|Caption can go here]]


'''Measured Variable:'''

Waves 2 and 3 were directly asked in the CIDI-SAM about their drinks per week. Only individuals who indicated drinking at least one drink (at least one of: can or bottle of beer, glass of wine or wine cooler, shot of hard liquor, or mixed drink with liquor) in the last 12 months were asked these questions. Individuals who did not indicate drinking at least one drink in the past month were set to missing.

'''Questions:'''

* <u>SAM C2TOT4</u>: Total number of drinks in the last week: # drinks

* <u> SAM C3TOT4</u>: Total number of drinks in a typical week, if different from the last week: # drinks

'''Combining variables:'''

Used # from C3TOT4 if available, otherwise used # from C2TOT4.


After data cleaning, the distribution of the measured variable looked like this:


[[File:CTS23DPW.jpeg|frameless|border|Caption can go here]]
[[File:LTS23DPW.jpeg|frameless|border|Caption can go here]]


Change over time to DPW:


[[File:CTS DPW23 Spaghetti.jpeg|frameless|border|CTS DPW]]
[[File:LTS DPW23 Spaghetti.jpeg|frameless|border|Caption can go here]]


To examine the correlation between computed and measured DPW variables over the waves, measures were left-anchored by adding a constant of 1 to all measures, then log-transformed, controlling for sex.

'''CTS Variables'''

[[File:Sexvardpw.jpeg|frameless|border|CTS DPW]]
{| class="wikitable"
|+Sex-Controlled CTS Drinks Per Week Variable Correlations (Log-Transformed)
|-
! !! Wave 1 Computed !! Wave 2 Computed !! Wave 2 Measured !! Wave 3 Measured
|-
| Wave 1 Computed || 1 || ||  || 
|-
| Wave 2 Computed || .15 || 1 ||  ||  
|-
| Wave 2 Measured || .15 || .63 || 1 || 
|-
| Wave 3 Measured  || .05 || .39 || .3 || 1
|-
|}

'''LTS Variables'''

[[File:SexvarLTSDPW.jpeg|frameless|border|LTS DPW]]
{| class="wikitable"
|+Sex-Controlled LTS Drinks Per Week Variable Correlations (Log-Transformed)
|-
! !! Wave 1 Computed !! Wave 2 Computed !! Wave 2 Measured !! Wave 3 Measured
|-
| Wave 1 Computed || 1 || ||  || 
|-
| Wave 2 Computed || -.16 || 1 ||  ||  
|-
| Wave 2 Measured || -.4 || .58 || 1 || 
|-
| Wave 3 Measured  || -.44 || .21 || .26 || 1
|-
|}