Add descriptions for Tier 1 data elements in the Global Code Book

[matthewhorridge]

The descriptions column is currently empty. Some basic descriptions could be reverse engineered from labels etc.

[matthewhorridge]

Here is an example for nih_education

The description

• Includes information about how this data element is the results of a harmonization
• It explains alternative wordings for the question/label
• It explains the meaning of certain options, in particular what option 97 means

nih_education

The nih_education data element is the result of the harmonization of several other RADx program-specific data elements: edu_years_of_school (RADx-UP); education (RADx-TECH); and, dht_education (RADx-DHT). RADx-rad studies do not have a corresponding data element.

The nih_education data element records a response to the question, or equivalent question, "What is the highest level of education you have acheived outside or in the United States". Equivalent questions are, "What is the highest grade or level of school you have completed or the highest degree you have received?" (RADx-TECH)

This is a single valued data element. The values for this data element are integers that come from a predefined enumeration of allowable values.

Users of this data element's data should be aware that the data value 97, "Other" only has a corresponding option in RADx-UP and RADx-DHT studies. Moreover, the data value 97, "Other" is context specific. Its meaning is specific to the options provided to participants in specific studies and hence specific RADx programs. The meaning of the value 97 MUST be discerned by examining the equivalent non-harmonized data.

Permissible Values

Value	Label
0	Have never gone to school
1	Some school (Includes any education received below highschool graduate level)
2	High school graduate or GED completed
3	Some college (graduated or not) associates degree,technical degree,or vocational degree
4	Bachelor's degree
5	Other advanced degree (Master's,Doctorate or Professional Doctorate)
97	Other
98	Don't know
99	Prefer not to answer