Cohort

Phase 3: Lists which cohort the individual belongs to. 1 = Old Ely; 2 = Young Ely; 3 = Ely retrospective; 4 = Ely refusal;

Integer

P2 DNA

Phase 2: DNA sample: 0 = Not taken, 1 = Taken and successful extraction, 2 = Unsuccessful extraction, 3 = Unknown status

Text

P3 DNA

Phase 3: 1 = DNA available

young missing this variable

Phase 3: 0 = , 1 = . Young missing this variable

Categorical

P2 BP treatment

Phase 2: follow up blood pressure treatment, 0 = no; 1 = yes

Categorical

Letter sent

Phase 3: Letter sent

Integer

matching variable for vitamin d study

Phase 1: matching variable for vitamin d study, 1 to 232

Integer

pa questionnaire completed

Phase 1: Has subject complete physical Activity questionnaire? (related to blue 4-page PA Q, form 4) 0 = no; 1 = yes;

Categorical

Availability of Plasma FA data 31-5-01

Phase 2: Availability of Plasma FA data 31-5-01. 1 = (presumably this is a 0/1 option variable)

Categorical

None

Phase 2: repeat testing undertaken. 0 = no; 1 = yes; 2 = incomplete;

Text

Sample-grp

Phase 2: Sample-grp. 1 = IR; 2 = IS; 3 = PG; 4 = IR+IS; 5 = IR+PG; 6 = IS+PG; 7 = IR+IS+PG;

Categorical

Urea

Phase 1: Urea measurement in?

Real

young missing this variable

Phase 3: Unclear what this variable relates to. Most likely an administrative record since it is stored next to letters_s, done and st_marys variables. Young missing this variable.

Categorical