AA is the abbreviation for African-American women. African-American women were enrolled in the
study at 1997, the same time as the sixth clinic visit of the main cohort. Because the
sixth clinic visit was the
baseline visit for the African-American cohort, the data for the AA women are
treated like a separate visit from the main cohort. The SAS variable names for
the baseline AA visit are prefixed with "AA" instead of "V6" before the
variable root name (see entry for "Naming convention, variables").
Visit 7, data from the main and AA cohorts are not treated as separate visits
(although statistics on these data are reported separately), and the AA and
main cohorts’ Visit 7 variable names share the "V7" prefix convention.
||Bone Mineral Content.
||Bone Mineral Density (BMC/bone area).
Cookies are small text files that are sent by websites and
temporarily about your session. Cookies are required to provide some of SOF
Online’s key functionality. Read more.
||Dual x-ray absorptiometry (used to measure BMD).
See Related: BMC, BMD, SPA
||as in fracture: new fracture occuring within given time period.
|Naming convention, variables
SAS variables (i.e., field names) are named such that the first two characters denote the
visit at which the data were collected (e.g., "V1" for visit 1). (See entry for "AA"
regarding the exception for the African-American cohort's baseline visit). The variable
names of equivalent data collected at different time points share the same "Root", which
is 1-6 characters long following the visit prefix. For example, the measurement for
current weight (Root = "WGHT") is named "V1WGHT" at visit 1, "V2WGHT" at visit 2,
etc. SOF Online often abbreviates the visit names with the "V#" convention, as you will
notice in the column headings for many tables on SOF Online.
||as in fracture: existing fracture at time of visit.
When referring to variables names, the "Root" pertains to the portion of the variable
name that denotes the specific measurement and remains consistent for that measurement
at different timepoints (see entry for "Naming convention, variables").
||Study of Osteoporotic Fractures
||single photon absorptiometry (used to measure BMD).
See Related: BMC, BMD, DXA