Details of Element: Difficulty With Vision
Component of Vision-Color-Tonography

Unique Name: diwiv
Contained in the Common BLSA Data Set ? Yes

Data Points (as of 09/06/98) Males Females Total
Number of Data Points 5368 1645 7013
Number of Distinct Participants 1277 613 1890
Year First Collected 1964 1978 -
Year Last Collected 1992 1992 -

Type of Variable: Absolute Measure
Encoding: Discrete
    Value Meaning
    0 No
    1 Yes
Precision: #.
Anticipated Range: 0. thru 1.
Masterfile Index: 611-01-12
Related Data Elements: none
Specific to this Data Element:
    Inclusion/Exclusion Rules: n/a
    Descriptive History: (none)
Details for this Data Type
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