R - Derived Variables

The main survey was conducted by a nurse

Derived Variables
SMOK42_1(Derived): Smoking at 42 codes 0 to 2
SMOK42_2(Derived): Smoking at 42 codes 0 to 6
Respondent:
Cohort Member
Keywords:

Valid:
9070
Missing:
307
Minimum:
0.0
Maximum:
6.0

Tabulation:
ValueLabelFreq. % 
0never smoked4156 45.8 
1ex:<1cig509 5.6 
2ex:>=1cig:>5yr1416 15.6 
3ex:>=1cig:<=5yr401 4.4 
4current:<1-9cig668 7.4 
5current:10-20cig846 9.3 
6current:>=20cig1074 11.8 
SC42_1(Derived): Social Class at 42
SC0_1(Derived): Social Class at birth
REG0_58(Derived): Region at birth (based on pre-1974 regions)
REG46_58(Derived): Region at age 46 (based on pre-1974 regions)
REG46_04(Derived): Region at age 46 (based on post-1974 regions)
BRESPS0(Derived): Final outcome code
BRESPS1(Derived): Summary of cohort, issued sample and response to biomed
BRESPS2(Derived): NCDS biomedical response - all cohort