Details of Element: do You Wear These All the Time
Component of Vision-Color-Tonography

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

Data Points (as of 09/06/98) Males Females Total
Number of Data Points 5279 1544 6823
Number of Distinct Participants 1254 574 1828
Year First Collected 1964 1978 -
Year Last Collected 1992 1992 -

Type of Variable: Absolute Measure
Encoding: Discrete
    Value Meaning
    0 No
    1 Yes
    2 Reading
    3 Distance
Precision: #.
Anticipated Range: 0. thru 3.
Masterfile Index: 611-01-02
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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