Details of Element: Extent of Color Deficiency
Component of Vision-Color-Tonography

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

Data Points (as of 09/06/98) Males Females Total
Number of Data Points 334 4 338
Number of Distinct Participants 120 4 124
Year First Collected 1965 1979 -
Year Last Collected 1988 1989 -

Type of Variable: Absolute Measure
Encoding: Discrete
    Value Meaning
    0 Mild
    1 Medium
    2 Strong
Precision: #.
Anticipated Range: 0. thru 2.
Masterfile Index: 611-01-17
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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