Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.
Description
Source of information
F01DPACK. Did each pack contain 10 cigarettes, 20 cigarettes, or another amount?
Imputation and derivation
Imputation
F01DPACK. Did each pack contain 10 cigarettes, 20 cigarettes, or another amount?
Others
Security
F01DPACK. Did each pack contain 10 cigarettes, 20 cigarettes, or another amount?