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Note that we’re among the first groups conducting such meta-analyses, and our analysis pipeline is currently restricted to continuous traits. Until methods are developed for binary traits, it is proposed that we analyze smoking initation as a continuous trait.
Note that we’re among the first groups conducting such meta-analyses, and our analysis pipeline is currently restricted to continuous traits. Until methods are developed for binary traits, it is proposed that we analyze smoking initation as a continuous trait.
=== (3) Average drinks per week, either as a current drinker or former drinker ===
=== (3) Pack Years ===
Number of cigarettes per day, divided by 20, then multiplied by the number of years the person has smoked.
=== (4) Age of Initiation of Smoking ===
The age an individual first became a regular smoker.
=== (5) Average drinks per week, either as a current drinker or former drinker ===
Individuals who either never drank, or on whom we have no data (e.g., someone was a former drinker but former drinking was not assessed) will be excluded from analysis. All types of liquor will be combined in the total estimate. If preferable, repeated measures designs (longitudinal data) can use all assessments by scaling and correcting for covariates within waves of assessment, then averaging across assessments.
Individuals who either never drank, or on whom we have no data (e.g., someone was a former drinker but former drinking was not assessed) will be excluded from analysis. All types of liquor will be combined in the total estimate. If preferable, repeated measures designs (longitudinal data) can use all assessments by scaling and correcting for covariates within waves of assessment, then averaging across assessments.
There was some cross-study variability on this measure. Some studies specified avg drinking during a specific window, such as the 12 months or last one month; most made no such specification. Two studies forced the respondent to select ranges.
There was some cross-study variability on this measure. Some studies specified avg drinking during a specific window, such as the 12 months or last one month; most made no such specification. Two studies forced the respondent to select ranges.
=== Ordinal versus Quantitative Phenotypes ===
=== Ordinal versus Quantitative Phenotypes ===
