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
B13BWEEKS. (How long has it been since you stopped smoking?) [ENTER NUMBER OF WEEKS]
Imputation and derivation
Imputation
B13BWEEKS. (How long has it been since you stopped smoking?) [ENTER NUMBER OF WEEKS]
Others
Security
B13BWEEKS. (How long has it been since you stopped smoking?) [ENTER NUMBER OF WEEKS]