EPIC_OSTEOP_AGE_PREV

Variable OSTEOP_AGE_PREV shows age at diagnosis of prevalent osteoporosis. it is created from the variables and coding rules written below.

Var definitions:

A_OSTEOP: EPIC elderly Greece variable showing age at diagnosis (in years) of osteoporosis

AGE_RECR_TR: EPIC elderly Greece variable showing age at recruitment

OSTEOP_PREV_FIRST: self reported diagnosis of osteoporosis recorded at the baseline

Coding rule:
Variable OSTEOP_AGE_PREV is identical to A_OSTEOP, for the self reported cases of prevalent osteoporosis.

Furthermore OSTEOP_AGE_PREV is coded as 999, if the age at ostoeporosis diagnosis is unavailable.

OSTEOP_AGE_PREV is equal to the age at recruitment (AGE_RECR_TR), for cases of incident osteoporosis.

Coding rule in STATA:

-gen OSTEOP_AGE_PREV= A_OSTEOP if OSTEOP_PREV_FIRST==1

-replace OSTEOP_AGE_PREV=999 if OSTEOP_AGE_PREV==.

-replace OSTEOP_AGE_PREV=AGE_RECR_TR if AGE_RECR_TR<A_OSTEOP & A_OSTEOP~=.